掲載種別：研究論文（国際会議プロシーディングス）  

This paper proposes temperature change mitigation systems for maintaining Li-ion battery performance. The system mitigates temperature change by the increment of the heat capacity around the target temperature utilizing commercial phase change material. This system can be achieved without power resources usage. This paper shows the system's design concept, specific discussion for implementation, and numerical and experimental study results to support our proposal. Firstly, we perform the individual experiment to measure the main characteristics of the battery and phase change material and defines the system's design requirement and key parameters for it. Then, the implementation plans are discussed and perform the experimental evaluation for the critical case. Based on the experimental analysis data, the proposed system is designed, and construct numerical models for evaluation. The effectiveness of the proposed system is evaluated via numerical simulations with realistic case studies.

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担当区分：最終著者,　責任著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：Japan Society of Mechanical Engineers  

DOI： 10.1299/jsmemecj.2020.j19125

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担当区分：最終著者,　責任著者   掲載種別：研究論文（学術雑誌）  

DOI： 10.1299/jsmemecj.2020.j19126

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

We prepared activated carbon (AC) and sulfur (S) composite cathodes. The present AC has developed micropores and a large pore volume. The composite could successfully include a large amount of S and exhibited stable cycle performance in a glyme-based electrolyte. An oxidation treatment of the AC with a concentrated nitric acid solution at 120 degrees C was found to improve S utilization in charge-discharge cycling. A cathode with the oxidized AC including S showed stable cycle performance with a high capacity in not only the glyme-based electrolyte but also a carbonate based electrolyte. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.85.671

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

Micropore-rich activated carbon with high surface area and pore volume was prepared by alkali activation of azulmic carbon (AZC) precursor as nitrogen-doped carbon; AZC was a carbonized product from azulmic acid. We successfully loaded a large amount of sulfur (S) into micropores of the activated AZC. Our two kinds of activated AZC (BET surface area: 1,747 and 2,319 m(2)g(-1)) can include S up to 55 and 62 wt%, respectively. The former activated AZC including S can be charged and discharged with lithium (Li) ion transfer stably and reversibly in glyme-based and carbonate-based electrolytes. The latter activated AZC can be charged and discharged in a glyme-based electrolyte. These different characteristics are due to a difference in fine pore structure between them. Our microporous activated AZC with high S loading is promising material as positive S electrode for rechargeable Li-S batteries. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.85.650

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE INC  

The effect of Li+ addition at the interface of a 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)amide ([C(2)mim][FSA]) room-temperature ionic liquid (RTIL) and a Pt electrode is investigated by infrared-visible sum-frequency generation (IV-SFG) vibrational spectroscopy. Addition of Li+ to the Pt vertical bar[C(2)mim1[FSA] system results in the extension of the electrochemical window (EW) by >1.0 Vat its negative edge. The potential dependence of the SF signal reveals that the [FSA](-) anion of neat [C2mim][FSAI is desorbed at 1.5 V while it remains in place even at 2.0 V when Li+ is added. The SFG spectra indicate that the [FSA](-) anion at the Pt vertical bar[C(2)mim][FSA] interface interacts with Li+ at the interface with the negatively-charged Pt electrode. This [FSA](-) anion layer anchored through Li+ suppresses [C(2)mirr](+) cation adsorption on the negatively-charged Pt electrode, resulting in a wider electrochemical window. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.elecom.2016.09.003

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：NATURE PUBLISHING GROUP  

A comprehensive understanding of the charge/discharge behaviour of high-capacity anode active materials, e.g., Si and Li, is essential for the design and development of next-generation high-performance Li-based batteries. Here, we demonstrate the in situ scanning electron microscopy (in situ SEM) of Si anodes in a configuration analogous to actual lithium-ion batteries (LIBs) with an ionic liquid (IL) that is expected to be a functional LIB electrolyte in the future. We discovered that variations in the morphology of Si active materials during charge/discharge processes is strongly dependent on their size and shape. Even the diffusion of atomic Li into Si materials can be visualized using a back-scattering electron imaging technique. The electrode reactions were successfully recorded as video clips. This in situ SEM technique can simultaneously provide useful data on, for example, morphological variations and elemental distributions, as well as electrochemical data.

DOI： 10.1038/srep36153

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

We propose novel hybrid capacitors (HCs) with electrolyte-involved redox reactions of bromide or iodide species by pretreatment of an activated carbon positive electrode. The treatment is simple; impregnation of pores at an activated carbon fiber cloth (ACFC) as a positive electrode with bromine- or iodine-containing water before cell assembly. The treated positive electrode is applied to a HC cell with a non-treated negative electrode of ACFC and its electrochemical performance is investigated by galvanostatic cycling and leakage current tests. Few studies on such "electrolytic" charge storage systems have provided acceptable capacitor performance because of inevitable self-discharge caused by diffusion of charged species form an electrode to the other one through an electrolyte. Nevertheless, our electrolyte-redox-based HCs show excellent performance without undesirable diffusion of charged species. Moreover, the present HC utilizing a bromide redox system fulfills a practical cell voltage of 1.8 V in spite of an aqueous electrolyte system. This high voltage provides excellent energy density, which is 5 times higher than that in a conventional aqueous electric double-layer capacitor (EDLC), and 1.2 times higher even than that in a 2.7 V-class non-aqueous EDLC, while keeping high charge discharge rate capability. (C) 2016 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2016.04.021

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：AMER INST PHYSICS  

The electrochemical and structural properties of the electrical double layers for two-component electrolytes were studied by Monte Carlo simulations using simple models. When the electrolyte contains two species of cations that have different diameters, the capacitance on the cathode dramatically increases as a large negative potential is applied. This behavior is qualitatively similar to the one reported in an experimental work that has used Li-containing ionic liquid as the electrolyte [M. Yamagata et al., Electrochim. Acta 110, 181-190 (2013)], in which it has also been reported that addition of Li ions to the electrolyte enhances the potential window to the negative side. The analysis of the ionic structure showed that the electrical double layer on the cathode is dominantly formed by the larger cations under small negative potentials, while they are replaced by the smaller cations under large negative potentials. This transition of the ionic structure with electrode potential is also consistent with the enhancement of the potential window that was found in the experimental work, which suggests that the organic cations are expelled from the electrical double layer under large negative potentials and the chance of decomposition is reduced. (C) 2016 AIP Publishing LLC.

DOI： 10.1063/1.4944927

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掲載種別：研究論文（国際会議プロシーディングス）  

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE INC  

Sulfur is an advantageous material as a promising next-generation positive electrode material for high-energy lithium batteries due to a high theoretical capacity of 1672 mA h g(-1) although its discharge potential is somewhat modest: ca. 2 V vs Li/Li+. However, a sulfur positive electrode has some crucial problems for practical use, which are mainly attributed to the dissolution of its intermediate products in charge-discharge processes. In order to resolve the dissolution problem of lithium polysulfide, we attempted to synthesize a sulfur-microporous activated carbon (AC) composite positive electrode. Moreover, we have systematically researched the battery performance of sulfur-microporous AC positive electrode with variations of electrolytes as well as negative electrodes, and found its promising positive electrode performance for a next generation rechargeable battery. (C) 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of Chinese Materials Research Society.

DOI： 10.1016/j.pnsc.2015.11.011

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

A prototype lithium-ion battery with a bis(fluorosulfonyl)imide (FSI)-based ionic liquid electrolyte was developed. The prototype was mounted on a demonstration module of the "Hodoyoshi-3" microsatellite, which was successfully launched on June 20, 2014. Qualification tests for space application, including radiation tolerance and vacuum tests, revealed negligible degradation of the ionic liquid-based lithium-ion battery (IL-LIB) cell. According to the flight data, the IL-LIB cell can exist stably in an ultra-high vacuum environment despite its thin and flexible pouch casing without any rigid anti-vacuum reinforcements. Furthermore, the power unit showed the same charge-discharge performance as that predicted by the charge-discharge behavior of an identical cell on the ground, suggesting that the IL-LIB cell maintains performance in high vacuum a microgravity environment. These results prove that LIB cells with FSI-based ionic liquids can be used as a power source for space applications. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.83.918

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：OXFORD UNIV PRESS  

By exploiting characteristics such as negligible vapour pressure and ion-conductive nature of an ionic liquid (IL), we established an in situ scanning electron microscope (SEM) method to observe the electrode reaction in the IL-based Li-ion secondary battery (LIB). When 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)amide ([C(2)mim][FSA]) with lithium bis(trifluoromethanesulfonyl) amide (Li[TFSA]) was used as the electrolyte, the Si negative electrode exhibited a clear morphology change during the charge process, without any solid electrolyte interphase (SEI) layer formation, while in the discharge process, the appearance was slightly changed, suggesting that a morphology change is irreversible in the charge-discharge process. On the other hand, the use of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl) amide ([C(2)mim][TFSA]) with Li[TFSA] did not induce a change in the Si negative electrode. It is interesting to note this distinct contrast, which could be attributed to SEI layer formation from the electrochemical breakdown of [C(2)mim](+) at the Si negative electrode vertical bar separator interface in the [C(2)mim][TFSA]based LIB. This in situ SEM observation technique could reveal the effect of the IL species electron-microscopically on the Si negative electrode reaction.

DOI： 10.1093/jmicro/dfv003

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

An alginate-based gel electrolyte with an ionic liquid (Alg/IL) is investigated for electric double-layer capacitors (EDLCs) by using physicochemical and electrochemical measurements. The Alg/EMImBF(4) (EMImBF(4) = 1-ethyl-3-methylimidazolium tetrafluoroborate) gel electrolyte is thermally stable up to 280 degrees C, where EMImBF4 decomposes. Furthermore, the EDLC with the gel electrolyte can be operated even at high temperature. The cell containing Alg/EMImBF(4) is also electrochemically stable even under high voltage (similar to 3.5 V) operation. Thus, the alginate is a suitable host polymer for the gel electrolyte for EDLCs. According to the result of charge discharge characteristics, the voltage drop in the charge discharge curve for the cell with Alg/EMImBF4 gel electrolyte is considerably smaller than that with liquid-phase EMImBF(4) electrolyte. To clarify the effect of Alg in contact with the activated carbon electrode, we also prepared an Alg-containing ACFC electrode (Alg ACFC), and evaluated its EDLC characteristics in liquid EMImBF(4). The results prove that the presence of Alg close to the active materials significantly reduces the internal resistance of the EDLC cell, which may be attributed to the high affinity of Alg to activated carbon. (C) 2015 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2015.01.144

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：Elsevier {BV}  

DOI： 10.1016/j.jpowsour.2015.01.070

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

We successfully improved the cycle stability of a silicon (Si) negative electrode that consisted of untreated, conventional micro-sized Si particles by applying polyimide (PI) with a low breaking elongation percentage and a high tensile strength as a binder. The strong adhesion of the PI binder suppresses the collapse of the Si negative electrode undergoing the expansion/contraction of Si particles during lithiation/delithiation so that the PI-Si electrode maintains a discharge capacity of 800 mAh g(-1) during 195 cycles at a current density of 800 mA g(-1). The electrodes prepared in this study contain a PI binder of 15 wt.% to maintain the electrode structure. Such a comparatively large amount of PI binder may prevent Li-ion access into Si particles. Nevertheless, the present Si negative electrode with sufficient electronic conductivity maintains a discharge capacity of 800 mAh g(-1) during 167 cycles even at a high rate (1600 mA g(-1)). Perhaps the PI binder does not hinder Li-ion access to Si particles. The cell containing a highly porous polyolefin film coated with ceramic as a separator for a facile supply of Li ion from a bulk electrolyte shows excellent cycle stability and maintains a discharge capacity of 800 mAh g(-1) during 300 cycles. (C) 2014 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2014.09.096

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

We investigated the effect of electrolyte additives on an untreated, conventional micro-sized (non-nano) Si electrode prepared with a polyimide (PI) binder (PI-Si electrode). Both additives, vinylene carbonate (VC) and fluoroethylene carbonate (FEC), improved the cycle stability of a PI-Si electrode half-cell. The solid-electrolyte interphase (SEI) formed by FEC includes a large amount of LiF and shows quite low resistance. This SEI effectively suppresses electrolyte decomposition, and an electrolyte containing VC mainly forms a SEI with organic components, and shows a smaller suppression effect on the electrolyte's excessive decomposition. From the AC impedance measurement and SEM observation results, we found that the formation of a massive SEI prevents contacts among Si particles and increases the charge-transfer resistance of the PI-Si electrode. The applied FEC suppresses the revolution of this resistance, meaning that FEC functions as an electrolyte additive suitable for PI-Si electrodes. A PI, Si, and soft-carbon composite (PI-Si-SC) electrode half-cell shows excellent cycle stability and rate performance by an adjusted amount of FEC (10 wt%). A full-cell, which includes a LiNi1/3Mn1/3Co1/3O2 positive electrode, the PI-Si-SC negative electrode, and the electrolyte containing 10 wt% FEC, also exhibits quite good cycle stability. (C) The Author(s) 2014. Published by ECS. All rights reserved.

DOI： 10.1149/2.0581503jes

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：Electrochemical Society Inc.  

Alginic acid (Alg-H) was applied as a novel aqueous binder for LiNi&lt
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1/3&lt
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Co&lt
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/inf&gt
Mn&lt
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1/3&lt
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O&lt
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2&lt
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(NMC) positive electrode for lithium-ion batteries (LIBs). We successfully obtained the pH-controlled aqueous slurry without any corrosion of NMC, which can also prevent a corrosion of an aluminum current collector. Using Alg-H can realize higher adhesive strength of the electrode even low content of 2 wt.% than using carboxymethyl cellulose and polyvinylidene difluoride. Galvanostatic charge-discharge cycle performances of both half cell and full cell composed of the NMC electrode with Alg-H are stable even at high voltage operation of 3.0-4.5 V, indicating that no side reaction including corrosion of the aluminum current collector and the decomposition of Alg-H binder occurs in this system. Moreover, this cell maintained over 90% of the initial discharge capacitance even after 100 cycles. These results suggest that the Alg-H binder has high potential to be used as an aqueous binder for positive electrodes of LIBs.

DOI： 10.1149/06418.0013ecst

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記述言語：日本語   掲載種別：研究論文（大学，研究機関等紀要）  

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記述言語：英語   出版者・発行元：AMER CHEMICAL SOC  

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記述言語：日本語   出版者・発行元：The Electrochemical Society of Japan  

DOI： 10.5796/electrochemistry.82.622

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

Now room-temperature ionic liquid (RTIL) is becoming a general term in the fields of science and technology owing to its useful physicochemical properties. A great number of applications with RTIL are proposed to date. Here we report an original electrochemical energy storage device with a Lewis acidic 60.0-40.0 mol% AlBr3-1-ethyl-3-methylimidazolioum bromide ([C(2)mim]Br) RTIL. The unique electrochemical reactions related to [AlBr4]-anion on the positive electrode have a crucial role in the energy storage device. The charge-discharge ratio for the beaker cell prepared in this investigation was almost 100% at 2.0 similar to 5.0 mA (150 similar to 370 mA g(-1) for activated carbon fiber cloth) if the cutoff voltage for the charging process was less than 1.70 V. The clear self-discharge behavior was not observed and the cell capacity after 100 cycles was identical to the maximum value. (C) The Author(s) 2014. Published by ECS.

DOI： 10.1149/2.029406jes

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

We propose a novel low-cost synthesis method of a LiFePO4/C composite with excellent battery performances that combine high-frequency induction heating with carbothermal reduction. Our method uses a very inexpensive Fe2O3 as a Fe source. The LiFePO4/C is synthesized in far less time (within a few minutes) at 900 C than in a conventional method. Although the initially synthesized LiFePO4/C (LFP-120) contains such over-reduction impurities as Fe2P or Fe3P, optimized LiFePO4/C (LFP-90) containing no impurities is obtained by adjusting the heating time. Moreover, the primary particle size of the LFP-90 is sufficiently small to achieve fast Li-ion diffusion. The cathode containing LFP-90 has good charge discharge rate performance and shows discharge capacities of 1533 and 100.1 mAh g(-1) at 1/10 and 10Crates. The cathode with LFP-90 has excellent cycle stability and shows no degradation after high-rate charge discharge tests. Our method reasonably reduces the manufacturing cost of LiFePO4/C. (C) 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2013.06.040

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD  

We evaluated the charge-discharge behavior of four types of graphite electrode, including raw synthetic graphite (SG), shaped natural graphite (NG), soft carbon-coated natural graphite (SCNG), and hard carbon-coated natural graphite (HCNG), in a 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMImESI) ionic liquid. Based on the charge-discharge curves for the first cycle in LiTESI/EMIrriFSI, capacity loss arising from an irreversible reaction on the graphite anodes was clearly observed for the cells consisting of SG and SCNG, whereas the capacity loss for the cells containing NC and HCNG was relatively low. The coulombic efficiency during cell cycling also confirmed that the charge-discharge behavior of graphite in LiTFSI/EMImESI is strongly affected by the surface structure of the graphite and that basal-plane-oriented graphite, such as NC and HCNG, can reduce the primary charge capacity loss. The advantages of the stable charge-discharge behavior provided by FSI-based ionic liquids for lithium ion batteries are also discussed based on the application of voltammetric and electrochemical impedance techniques to model carbon electrodes in ionic liquids. Based on these analyses, a mechanism involving a double-layer-based interface (not a solid electrolyte interface (SEI)) is proposed to stabilize the surface of graphite negative electrodes. (C) 2013 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.electacta.2013.03.018

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：ELECTROCHEMICAL SOC INC  

Alginate salts (Alg-salt) were used as binders for graphite electrodes in both ionic liquid (IL)- and organic-electrolyte-based lithium-ion batteries (LIBs). Two different types of Alg-salt were used in this study: Alg-Na and Alg-Mg. According to the cyclic voltammograms and charge–discharge measurements, a graphite negative electrode with the Alg-Na binder in both IL and conventional organic electrolytes exhibited reversible and high C-rate capability compared with an electrode with an SBR binder. This implies that the high affinity of Alg for graphite electrode active materials decreases the electrode/electrolyte interfacial resistance. We also fabricated full cells composed of the prepared graphite electrode with Alg-salt and LiNi_1/3Co_1/3Mn_1/3O₂ (NMC/C+Alg-X, X = Na⁺ or Mg²⁺). During high-voltage (3.0–4.5 V) operation, NMC/C+Alg-Mg showed the most stable cycle performance with high coulombic efficiency. These results suggest that the Alg-salt binder, especially the Alg-Mg binder, can be used in the fabrication of high-performance LIBs with either an IL- or organic-based electrolyte.

DOI： 10.1149/05329.0093ecst

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その他リンク： https://iopscience.iop.org/article/10.1149/05329.0093ecst/pdf

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

The charge-discharge behavior of electric double-layer capacitors (EDLCs) composed of several ionic liquids and their lithium solutions were evaluated. The model EDLC cell with a Li+-containing ionic liquid electrolyte, LiTFSI/EMImFSI (LiTFSI = lithium bis(trifluoromethylsulfonyl)imide, EMImFSI = 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide), exhibited a higher discharge capacitance than the cell containing EMImFSI, whereas the discharge capacitance of the cell with LiTFSI/EMImTFSI was lower than that of the cell containing EMImTFSI. In addition, the cells composed of EMImBF(4)-based electrolytes displayed similar charge-discharge characteristics irrespective of the presence of the corresponding lithium salts. The distinctive results for the EDLCs with lithium-containing ionic liquid electrolytes are also discussed based on the application of the electrochemical impedance technique to model carbon electrodes in ionic liquids. According to the obtained differential capacitance of the model glassy carbon electrode in each ionic liquid electrolyte, the electric double-layer (compact layer) structure at the electrode/electrolyte interface depends on the component anion species of the ionic liquid and the co-existence of the anion and Lit. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.81.857

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

Chitosan-based gel electrolytes with ionic liquids (Chi/IL) were prepared and investigated for use in electric double-layer capacitors (EDLCs). The voltage drop for the test cell with Chi/EMImBF(4) (EMImBF(4) = 1-ethyl-3-methylimidazolium tetrafluoroborate) or Chi/DEMEBF4 (DEMEBF4 = N,N-diethyl-N-methyl-N-2-methoxyethylammonium tetrafluoroborate) and activated carbon fiber cloth electrodes (ACFCs) was smaller than that with the corresponding ionic liquid electrolyte. To clarify the effect of the presence of Chi in contact with the carbon electrode, we also prepared the Chi-containing ACFC electrode (Chi+ACFC) and evaluated its charge-discharge characteristics in EMImBF(4). The results proved that the presence of Chi on the active materials reduces the internal resistances of the cell and plays an important role in the improvement of the EDLC performance. In addition, the high-voltage operation of the test cells with Chi-based gel electrolytes was investigated. These results suggest that the Chi is suitable for use in practical high-performance and safe EDLCs. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.81.867

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担当区分：最終著者   記述言語：日本語   掲載種別：研究論文（大学，研究機関等紀要）  

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）  

Nonaqueous gel electrolytes based on chitosan and 1-ethyl-3- methylimidazolim tetrafluoroborate (Chi/EMImBF4) are prepared for electric double-layer capacitors (EDLCs). The transparent colorless gel sheet has the high levels of mechanical strength and ionic liquid retention required in EDLC cells. Charge-discharge measurements revealed that a model EDLC cell with a chitosan gel exhibits high discharge capacitance although a gel-state electrolyte was used, indicating that the high affinity of chitosan for the activated carbon electrode decreases the electrode-electrolyte interfacial resistance. A test cell with Chi/EMImBF4 maintained a Coulombic efficiency of more than 99.9% during 5000 cycles. © 2012 Elsevier Ltd.

DOI： 10.1016/j.electacta.2012.05.073

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：ELECTROCHEMICAL SOC INC  

We evaluated charge-discharge behavior of four graphite electrodes—raw synthetic graphite (SG), shaped natural graphite (NG), soft carbon-coated natural graphite (SCNG), and hard carbon-coated natural graphite (HCNG)—in a 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMImFSI) ionic liquid containing lithium bis(trifluoromethylsulfonyl)imide (LiTFSI). According to charge-discharge curves at the first cycle in LiTFSI/EMImFSI, a capacity loss by an irreversible reaction was observed for cells with SG and SCNG, whereas the capacity loss for cells with NG and HCNG was relatively small. Coulombic efficiency with the cell cycling also proved that charge-discharge behavior of the graphite electrodes in LiTFSI/EMImFSI is strongly affected by surface structure of the graphite active materials and that basal-plane-oriented graphite, such as NG and HCNG, can reduce the loss of primary charge capacity.

DOI： 10.1149/05026.0317ecst

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その他リンク： https://iopscience.iop.org/article/10.1149/05026.0317ecst/pdf

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Electrochemical Society  

A nonaqueous solid-state electrolyte based on an alginate (Alg) with a conventional supporting electrolyte was prepared for use in electric double layer capacitors (EDLCs). According to the charge/discharge measurements, despite the use of a solid-state electrolyte, the model EDLC cells containing the Alg-based electrolyte possessed a higher discharge capacitance than the corresponding solution-based electrolyte, which implies that the high affinity of Alg for activated carbon electrodes decreases the electrode/electrolyte interfacial resistance. Because of its good affinity for carbon materials, we also applied Alg as a binder to an activated carbon-based composite electrode. The test cells with the composite electrodes containing Alg demonstrated a remarkably powerful EDLC performance using both a conventional organic-solution-based electrolyte and a highly viscous ionic liquid electrolyte.

DOI： 10.1149/05043.0027ecst

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その他リンク： https://iopscience.iop.org/article/10.1149/05043.0027ecst/pdf

担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

We evaluated the charge-discharge behavior of a graphite electrode in a 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMImFSI) ionic liquid. According to the charge-discharge tests, the graphite negative electrode exhibited a high rate of performance in LiTFSI/EMImFSI (TFSI- = bis(trifluoromethylsulfonyl)imide) in the voltage range of 0.005-1.5 V (vs. Li/Li+), and the performance was comparable to that in a conventional organic solution-based electrolyte, LiPF6/EC+DMC. Moreover, the addition of LiBOB (=lithium bis(oxalato)borate) improved the rate capability and low-temperature operation of the graphite negative electrode, most likely owing to the low-resistivity solid electrolyte interface (SEI) derived from LiBOB. These results suggest that EMImFSI is a suitable electrolyte for lithium-ion batteries utilizing graphite negative electrodes and that optimization of the electrolyte composition with an additive can improve battery performance. (C) 2012 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2012.11.013

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記述言語：英語   掲載種別：研究論文（学術雑誌）  

The high-frequency induction heating method is an attractive way to synthesize LiFePO4/C within a few minutes. We optimize the heating conditions by a carbon crucible for the homogeneous heating of a precursor pellet from both sides. Compared with our previous samples, the lattice parameters of the LiFePO4/C synthesized in this work (an optimized sample) are improved and are much closer to the values reported by Padhi et al. Although the primary particle size of the optimized sample is slightly larger than that of the previous samples, it is sufficiently small to fully utilize the electrochemical performances of LiFePO4. We reduced the internal charge-transfer resistance of the optimized sample by improving the crystal structure because the Nyquist plots of the electrodes indicate decreased resistance, even though the optimized sample's electronic conductivity is almost the same as that of the previous sample. The electrode based on the optimized sample shows a specific discharge capacity of 168.0 mAh g-1, which achieves 99% theoretical specific capacity of the LiFePO4 phase. Moreover, its charge-discharge rate performance is superior to that of the previous sample. © 2013 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2013.06.051

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記述言語：日本語   掲載種別：研究論文（学術雑誌）  

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ROYAL SOC CHEMISTRY  

An activated carbon composite electrode for nonaqueous electric double-layer capacitors was prepared with alginate. A model cell with this electrode showed an ultrahigh rate capability, presumably because of the high affinity of alginate for activated carbon, which decreased the internal resistance of the composite electrode.

DOI： 10.1039/c2ra22188h

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD  

We propose a novel electrochemical capacitor (EC) utilizing an "electrolytic" charge-storage system of bromide species. The present EC cell is fabricated with 1.0 mol dm(-3) 1rethyl-3-methylimidazolium bromide dissolved in 1-ethyl-3-methylimidazolium tetrafluoroborate as an electrolyte and activated carbon fiber cloths (ACFCs) as electrodes. Although such a charge-storage concept would usually be useless due to inevitable, undesirable reactions, e.g. shuttle reaction or migration of active redox species between electrodes, we attain much-enhanced capacitance with an excellent reversibility by suppressing an undesirable diffusion process. In fact, the coulombic efficiency of the present cell is over 99.7% at 100 mA g(-1) The oxidation species such as Br-2 or Br-3(-) as charge accumulators do not diffuse from a positive electrode into the electrolyte. Moreover, the present EC cell has an excellent cycleability of at least 10,000 cycles. (C) 2012 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.electacta.2012.01.031

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担当区分：責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

We evaluated the charge-discharge behavior of a LiNi1/3Mn1/3Co1/3O2 (NMC) electrode in a 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMImFSI) ionic liquid. At 163 mAh g(-1) after 50 cycles, the discharge capacity of the NMC cathode in LiTFSI/EMImFSI (TFSI- = bis(trifluoromethylsulfonyl)imide) at 1.0 C in the voltage range 3.0-4.5V (vs. Li/Li+) is comparable to that in the conventional electrolyte, LiPF6/EC+DMC. Moreover, the rate capability of the cell with LiTFSI/EMImFSI exceeded that with LiPF6/EC+DMC, especially at high rates, probably owing to the low resistance at the electrode/electrolyte interface. These results suggest that EMImFSI is a suitable electrolyte for lithium-ion batteries utilizing an NMC cathode. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.80.808

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

The present LiFePO4/C cathode material is synthesized via carbothermal reduction by a high-frequency induction heating method in extremely short heating time (within a few minutes). The electric conductivity of LiFePO4/C is improved to 1.9 x 10(-2) S cm(-1) by a short-time annealing process following a sintering process at 900 degrees C. An increase in the particle size and formation of Fe2P as impurity are suppressed by annealing at a relatively low temperature: 700 degrees C. The cathode containing annealed LiFePO4/C shows discharge capacities of 156.0, 136.3, and 100.1 mAh g(-1) at 1/10, 1, and 10C-rates (1C = 170 mA g(-1)), respectively, and its polarization between charge and discharge is smaller than that of non-annealed LiFePO4/C. Furthermore, the annealed LiFePO4/C cathode shows better charge and discharge rate performance than the non-annealed LiFePO4/C cathode. (C) The Electrochemical Society of Japan, All rights reserved.

DOI： 10.5796/electrochemistry.80.825

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記述言語：日本語   出版者・発行元：電気化学会溶融塩委員会  

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：ELECTROCHEMICAL SOC INC  

We propose a novel electrochemical capacitor (EC) utilizing an "electrolytic" charge-storage system of bromide species. The present EC cell is fabricated with 1.0 mol dm(-3) 1-ethyl-3-methylimidazolium bromide dissolved in 1-ethyl-3-methylimidazolium tetrafluoroborate as an electrolyte and activated carbon fiber cloths as electrodes. Although such a charge-storage concept would usually be useless due to inevitable, undesirable reactions, e. g. shuttle reaction or migration of active redox species between electrodes, we attain much-enhanced capacitance with an excellent reversibility by suppressing an undesirable diffusion process. In fact, the coulombic efficiency of the present cell is over 99.7% at 100 mA g(-1). The oxidation species such as Br-2 or Br-3(-) as charge accumulators do not diffuse from a positive electrode into the electrolyte. Moreover, the present EC cell has an excellent cycleability of at least 10,000 cycles.

DOI： 10.1149/1.3693060

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：ELECTROCHEMICAL SOC INC  

Non-aqueous gel electrolytes based on polysaccharides (alginate or chitosan) with hydrophobic 1-ethyl-3-methylimidazolim tetrafluoroborate (EMImBF(4)) were prepared for electric double layer capacitors (EDLCs). The transparent colorless gel sheets have high mechanical strength and high retentivity of EMImBF4 enough to construct EDLC cells. According to charge/discharge measurements, the model EDLC cells with alginate-and chitosan-based gels show high discharge capacitance in spite of using a gel-state electrolyte, implying that high affinity of alginate for an activated carbon electrode leads to a decrease in the electrode/electrolyte interfacial resistance. A test cell with Alg/EMImBF(4) maintains its coulombic efficiency over 99.8 % during 5,000 cycles.

DOI： 10.1149/1.3693061

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記述言語：日本語   出版者・発行元：The Electrochemical Society of Japan  

DOI： 10.5796/electrochemistry.79.502

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：ELECTROCHEMICAL SOC INC  

We evaluated the electrochemical behavior of a LiNi1/3Mn1/3Co1/3O2 (NMC) electrode in a neat ionic liquid, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl) imide (EMImFSI), electrolyte. According to charge/discharge measurements, the discharge capacity of the NMC cathode in EMImFSI at 1 C in a voltage range of 3.0-4.5 (vs. Li/Li+) shows 165 mAh g(-1), which is higher than that in a conventional electrolyte, EC+DMC. The rate capability of a cell with EMImFSI exceeds that with EC+DMC, especially at high rates, probably due to a low resistance at the electrode/electrolyte interface. These results suggest that EMImFSI is a suitable electrolyte for Li-ion batteries utilizing a NMC cathode. Also, we applied fluorine-containing solvents (FCSs) to an electrolyte for Li-ion batteries with a cobalt oxide (LiCoO2) cathode to enhance the upper voltage limit and investigated its electrochemical properties in a proposed FCS-based electrolyte. A test cell containing a FCS-based electrolyte exhibits high and stable discharge capacity for 30 cycles even with a high upper cutoff voltage of 4.5 V when compared with a cell containing a conventional electrolyte.

DOI： 10.1149/1.3563087

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

Non-aqueous gel electrolytes based on an alginate (Alg) and 1-ethyl-3-methylimidazolim tetrafluoroborate (EMImBF(4)) are prepared for electric double layer capacitors (EDLCs). The transparent colorless gel sheet has the high levels of mechanical strength and retentivity of ionic liquid needed to construct EDLC cells. According to charge/discharge measurements, a model EDLC cell with an Alg/EMImBF(4) gel shows high discharge capacitance in spite of using a gel-state electrolyte, implying that high affinity of alginate for an activated carbon electrode leads to a decrease in the electrode/electrolyte interfacial resistance. A test cell with Alg/EMImBF(4) maintains its coulombic efficiency over 99.8% during 5,000 cycles. (C) 2011 The Electrochemical Society. [DOI: 10.1149/2.020111esl] All rights reserved.

DOI： 10.1149/2.020111esl

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

An acidic cellulose-chitin hybrid gel electrolyte consisting of cellulose, chitin, 1-butyl-3-methylimidazolium, 1-allyl-3-methylimidazolium bromide, and an aqueous H(2)SO(4) solution is investigated for electric double layer capacitors (EDLCs) with activated carbon fiber cloth electrodes. The acidic cellulose-chitin hybrid gel electrolyte shows a high ionic conductivity comparable to that for an aqueous 2 mol dm(-3) H(2)SO(4) solution at 0-80 degrees C. This system's temperature dependence in EDLC performance is investigated by galvanostatic charge-discharge measurement. An EDLC cell with the acidic hybrid gel electrolyte has higher capacitance than that with the aqueous H(2)SO(4) solution in the range of operation temperatures (-10 to 60 degrees C). Moreover, the capacitance retention of the EDLC cell with the acidic hybrid gel electrolyte is better than that of a cell with the H(2)SO(4) solution at 60 degrees C over 10,000 cycles. This suggests that the proposed acidic gel electrolyte has excellent stability in the presence of a strong acid, even at a high temperature of 60 degrees C. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2010.02.037

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER  

An ionic liquid electrolyte containing bis(fluorosulfonyl)imide (FSI) anion without any solvent is applied to a silicon-nickel-carbon (Si-Ni-carbon) composite anode for rechargeable lithium (Li)-ion batteries. The FSI-based ionic liquid electrolyte successfully provides a stable, reversible capacity for the Si-Ni-carbon anode, which is comparable to the performance observed in a typical commercialized solvent-based electrolyte, while a common ionic liquid electrolyte containing bis(trifluoromethanesulfonyl)imide (TFSI) anion without FSI presents no reversible capacity to the anode at all. Ac impedance analysis reveals that the FSI-based electrolyte provides very low interfacial and charge-transfer resistances at the Si-based composite anode, even when compared to the corresponding resistances observed in a typical solvent-based electrolyte. Galvanostatic cycling of the Si-based composite anode in the FSI-based electrolyte with a charge limitation of 800 mAh g(-1) is stable and provides a discharge capacity of 790 mAh g(-1) at the 50th cycle, corresponding to a cycle efficiency of 98.8%. (C) 2010 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2010.01.011

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

We applied fluorine-containing solvents (FCSs) to an electrolyte for lithium (Li)-ion batteries with a cobalt oxide (LiCoO2) cathode to enhance the upper voltage limit and investigated its electrochemical properties in a proposed FCS-based electrolyte. FCSs were expected to have high oxidation resistance by introducing electron withdrawing fluorine atoms. A test cell containing a FCS-based electrolyte exhibited high and stable discharge capacity in 30 cycles even with a high upper cutoff voltage of 4.5 V when compared with a cell containing a conventional electrolyte. This improvement in the cycle performance was confirmed by an electrochemical impedance measurement. We found that the FCS-based electrolyte provides a favorable solid electrolyte interface (SEI) at the LiCoO2 cathode, leading to reversible charge-discharge behavior of the cathode.

DOI： 10.5796/electrochemistry.78.345

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：ELECTROCHEMICAL SOC INC  

Non-aqueous gel electrolytes based on an alginate (Alg) and 1-ethyl-3-methylimidazolim tetrafluoroborate (EMImBF4) were prepared for electric double layer capacitors (EDLCs). The transparent colorless gel sheet has high mechanical intensity and high retentivity of ionic liquids enough to construct EDLC cells. According to charge/discharge measurements, the model EDLC cell with an Alg/EMImBF4 gel shows high discharge capacitance in spite of using a gel-state electrolyte, implying that high affinity of alginate for an activated carbon electrode leads to a decrease in the electrode/electrolyte interfacial resistance. A test cell with Alg(3%)/EMImBF4 maintains its coulombic efficiency over 99.8 % during 4,000 cycles.

DOI： 10.1149/1.3414018

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その他リンク： https://iopscience.iop.org/article/10.1149/1.3414018

記述言語：英語   出版者・発行元：ELSEVIER SCIENCE INC  

DOI： 10.1016/j.elecom.2010.01.012

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER  

A novel capacitor electrode auxiliary, deoxyribonucleic acid (DNA). is applied to an electric double layer capacitor (EDLC) containing an aqueous 3.5 M NaBr electrolyte The present electrode is composed of activated carbon (95 wt %) and DNA (2 5 wt %) with polytetrafluoroethylene (PTFE) as a binder (2 5 wt.%). An EDLC cell with the DNA-loading electrodes exhibits improved rate capability and discharge capacitance. Art EDLC cell with DNA-free electrodes cannot discharge above a cut rent density of 3000 mA g(-1) (of the electrode), while a cell with the DNA-loading electrodes can work at least up to 6000 mA g(-1) Moreover, an open-circuit potential (OCP) of the DNA-loading electrode sifts negatively with ca 0 2 V from an OCP of the corresponding electrode without DNA It is noteworthy that a small amount of DNA loading(2 5 wt %) to the activated carbon electrode not only improves the rate capability but also adjusts the working potential of the electrode to a more stable region. (C) 2009 Elsevier B.V. All rights reserved

DOI： 10.1016/j.jpowsour.2009.09.049

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Electrochemical Society  

An acidic cellulose-chitin hybrid gel electrolyte consisting of cellulose, chitin, 1-butyl-3-methylimidazolium, 1-allyl-3-methylimidazolium bromide, and an aqueous H2SO4 solution is investigated for electric double layer capacitors (EDLCs). This gel electrolyte shows a high ionic conductivity comparable to that observed in an aqueous 2 mol dm-3 H2SO4 solution. An EDLC cell with the acidic hybrid gel electrolyte has higher capacitance than that with an aqueous H2SO4 solution in the operation temperature. Moreover, the capacitance retention of the EDLC cell with the acidic hybrid gel electrolyte is better than a cell with a H2SO4 solution over 10,000 cycles. This suggests that the present acidic gel electrolyte has excellent stability in the presence of a strong acid even at a high temperature.

DOI： 10.1149/1.3334797

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その他リンク： https://iopscience.iop.org/article/10.1149/1.3334797

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

An acidic cellulose-chitin hybrid gel electrolyte is prepared from cellulose, chitin, binary ionic liquids, and an aqueous H(2)SO(4) solution for an electric double-layer capacitor (EDLC). The obtained acidic hybrid gel shows a high ionic conductivity of 57.8 S m(-1) at a room temperature of 25 degrees C, which is comparable to 61.9 S m(-1) of an aqueous 2 mol dm(-3) H(2)SO(4) electrolyte. The acidic cellulose-chitin hybrid gel electrolyte is applied to an EDLC cell with activated carbon fiber cloths as polarizable electrodes, and its electrochemical performance is investigated by galvanostatic cycling, cyclic voltammetry, and a self-discharge test. The EDLC cell with the acidic cellulose-chitin hybrid gel electrolyte exhibits a higher capacitance and a better cycle life than cells with the reference aqueous H(2)SO(4) electrolyte. The self-discharge measurement suggests that leakage current and potential decay are suppressed by the application of the acidic cellulose-chitin hybrid gel electrolyte. These results indicate that the acidic cellulose-chitin hybrid gel electrolyte has a practical applicability to an advanced EDLC with excellent stability and working performance.

DOI： 10.1149/1.3270498

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

The electrochemical behavior of a graphitized electrode was investigated in a room-temperature ionic liquid based on bis(fluorosulfonyl)imide (FSI-) with the addition of propylene carbonate (PC) or vinylene carbonate (VC). The reversible, significant lithium-ion (Li+) insertion/extraction was observed in the additive-free FSI-based ionic liquid, while the additive systems showed weak, reversible responses (VC) and degraded responses (PC). AC impedance measurements suggested that the presence of FSI- extremely reduces the electrode/electrolyte interface impedance, which allows Li+ to intercalate into a graphitized electrode reversibly. By contrast, the addition of VC inhibits the reversible Li+ intercalation in spite of FSI- existence.

DOI： 10.5796/electrochemistry.77.696

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE INC  

A novel acidic cellulose-chitin hybrid gel electrolyte including binary ionic liquids (ILs) with an aqueous H(2)SO(4) solution was prepared for an electric double layer capacitor (EDLC). Its electrochemical characteristics were investigated by galvanostatic charge-discharge measurements. The test cell with a hybrid gel electrolyte shows a specific capacitance of 162 F g(-1) at room temperature, which is higher than that for a cell with an H(2)SO(4) electrolyte, 155 F g(-1). This hybrid gel electrolyte exhibits excellent high-rate discharge capability in a wide range of current densities as well as an aqueous H(2)SO(4) solution. The discharge capacitance of the test cell can retain over 80% of its initial value in 100,000 cycles even at a high current density of 5000 mA g(-1). (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.elecom.2008.10.039

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

We demonstrate the effect of bundle structure, composed of multiwalled carbon nanotube (MWCNT) material in disordered MWCNT electrodes, on electric double-layer capacitor (EDLC) performance (i.e., their rate capability and specific capacitances). This is done by applying two types of MWCNTs with low (50-100) and high (2500-10,000) aspect ratios of their length to diameter. The use of these physically opposite values elucidates how the electronic pathways, pore distribution, and sidewall/edge balance of MWCNTs contribute to these electrodes' kinetic and capacitive performance for EDLC. (C) 2008 The Electrochemical Society. [DOI: 10.1149/1.3049907] All rights reserved.

DOI： 10.1149/1.3049907

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

A novel acidic cellulose-chitin hybrid gel electrolyte including binary ionic liquids (ILs) with an aqueous H2SO4 solution was prepared for an electric double layer capacitor (EDLC). Its electrochemical characteristics were investigated by galvanostatic charge-discharge measurements. The cell with the hybrid gel containing binary ILs and H 2SO4 has higher capacitance than that containing only the aqueous H2SO4 solution. This hybrid gel electrolyte exhibits excellent high-rate discharge capability in a wide range of current densities as well as an aqueous H2SO4 solution. The discharge capacitance of the test cell can retain over 80% of its initial value in 100,000 cycles even at a high current density of 5,000 mA g-1. ©The Electrochemical Society.

DOI： 10.1149/1.3109629

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

A series of fluorohydrogenate ionic liquids (FHILs), Cat(+)(FH)(2.3)F(-) (Cat(+): alkylpyridinium cations and allylated quarternary cyclic ammonium cations), are prepared, and their physical and electrochemical properties are characterized. The viscosities and conductivities of alkylpyridinium-based FHILs increase and decrease, respectively, with an increase in the length of the side chain. The FHILs of allylated cations exhibit higher ionic conductivities than those of the corresponding propylated cations and even those of the ethylated cations in some cases, which is explained by differences in volume, charge distribution, and rotational freedom of the side chains according to quantum mechanical calculations. The electrochemical windows of the FHILs are around 4 V.

DOI： 10.1149/1.3117215

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Introduction of bis(fluorosulfonyl)imide (FSI) as an anion to an ambient-temperature ionic liquid electrolyte based on 1-ethyl-3- methylimidazolium and lithium (Li) as cations can provide a reversible Li intercalation into a graphitized electrode, while the intercalation is completely irreversible without FSI. Laser desorption/ionization mass spectroscopy and ac impedance spectroscopy suggest that FSI-coordinated Li + is facilely mobile even without any solvents and is reversibly accessible to a graphite interior. ©The Electrochemical Society.

DOI： 10.1149/1.3123129

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

We successfully prepared a vertically aligned double-walled carbon nanotube (DWCNT) sheet by a transfer procedure from a silicon substrate as a DWCNT seedbed that was covered with catalyst grains to an aluminum sheet as a current collector for application to a high-performance electrode for an electric double layer capacitor (EDLC). The charge-discharge characteristics and EDLC performances of the aligned DWCNT electrode were evaluated and compared with those of a vertically aligned multi-walled CNT (MWCNT) electrode. The gravimetric capacitance of the DWCNT electrode was ca. four times larger than that of the MWCNT electrode. The rate capability of the DWCNT electrode was found to be excellent. This is mainly ascribed to our transfer technique. (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2008.09.020

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

An ionic liquid, 1-ethyl-3-methyl imidazolium bis(fluorosulfonyl)imide (EMI-FSI), has been applied to an electrolyte for electric double layer capacitors (EDLCs). The electrolyte exhibited high ionic conductivity comparable to that of a conventional organic electrolyte. EDLC prepared with EMI-FSI showed excellent rate capability although the electrolyte is a neat ionic liquid; this performance was observed irrespective of the presence of a binder in an activated carbon-based electrode. The self-discharge was suppressed by using EMI-FSI. A cycling durability test showed that the cell with EMI-FSI kept over 90% of the initial capacitance even after 10,000 cycles. (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2008.08.086

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担当区分：筆頭著者  

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELSEVIER SCIENCE BV  

The physicochemical properties of molten alkali bis(trifluoromethylsulfonyl)amide, MTFSI (M = Li, K, Cs), mixture (chi(LiTFSI) = 0.20, chi(KTFSI) = 0.10, chi(CsTFSI) = 0.70) were studied to develop a new rechargeable lithium battery operating at intermediate temperature (100-180 degrees C). The viscosity and ionic conductivity of this melt at 150 degrees C are 87.2 cP and 14.2 mS cm(-1), respectively. The cyclic voltammetry revealed that the electrochemical window at 150 degrees C is as wide as 5.0 V, and that the electrochemical deposition/dissolution of lithium metal occurs at the cathode limit. A Li/MTFSI (M = Li, K, Cs)/LiFePO4 cell showed an excellent cycle performance at a constant current rate of C/10 at 150 degrees C; 95% of the initial discharge capacity was maintained after 50 cycles. Except for the initial few cycles, the coulombic efficiencies were approximately 100% for all the cycles, indicating the stabilities of the molten MTFSI mixture and all the electrode materials. (C) 2008 Elsevier B.V. All rights reserved.

DOI： 10.1016/j.jpowsour.2008.05.054

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担当区分：筆頭著者,　責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）  

Origins of cathodic stability of an ionic liquid electrolyte, 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF4) containing lithium tetrafluoroborate (LiBF4), are investigated mainly by applying electrochemical impedance spectroscopy for a glassy-carbon electrode interface. Its Helmholtz layer capacitance in the EMIBF4 electrolyte containing Li+ becomes much higher than that in neat EMIBF 4 with increasing cathodic polarization. On the basis of such analyses as well as our hypotheses, a reasonable mechanism for the stabilizing effect induced by the Li salt addition is discussed. © The Electrochemical Society.

DOI： 10.1149/1.2985636

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担当区分：筆頭著者   記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：PERGAMON-ELSEVIER SCIENCE LTD  

The electrochemical behavior of FeCP2+/FeCp2 (Cp-, cyclopentadienyl), FeCl4-/FeCl42-, FeBr4-/FeBr42- and Fe(CN)(6)(3-)/Fe(CN)(6)(4-) couples was studied in the hydrophobic room-temperature ionic liquids based on bis(trifluoromethylsulfonyl)imide (TFSI-) with 1-n-butyl-1-methylpyrrolidinium (BMP+) and other quaternary ammonium cations. The cyclic voltammetric data indicated that these complexes were stable in BMPTFS1 and that the redox reactions between trivalent and divalent iron species of these complexes are electrochemically reversible. The diffusion coefficients of these complexes were found to be affected mainly by the size of the species. On the other hand, the redox potential of Fe(CN)(6)(3-)/Fe(CN)(6)(4-) couple depended on organic cations reflecting the difference in the acceptor properties of the organic cations. (c) 2006 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.electacta.2006.10.008

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

The electrochemical behavior of samarium (Sm), europium (Eu), and ytterbium (Yb) was investigated in the hydrophobic room-temperature molten salts based on bis (trifluoromethylsulfonyl)imide (TFSI-) combined with either 1-ethyl-3-methylimidazolium (EMI+) or 1-n-butyl-1-methylpyrrolidinium (BMP+). The redox reactions of Sm(III)/Sm(II), Eu(III)/Eu(II), and Yb(III)/Yb(II) were observed at -1.6, -0.3, and -1.0 V vs Ag/Ag(I), respectively. In all cases, the electrode reactions were found to be quasi-or irreversible by the cyclic voltammetry. The diffusion coefficients of these lanthanides were estimated to be similar to 10(-8) cm(2) s(-1) by chronoamperometry and chronopotentiometry, indicating that their mobility is rather low, probably due to the complex formation or the strong coulombic interaction with TFSI-. The redox potentials of these divalent and trivalent lanthanide couples suggested that the donor property of TFSI--based room-temperature molten salts was lower than that of other conventional solvents. (c) 2005 The Electrochemical Society.

DOI： 10.1149/1.2136088

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

The electrochemical behaviors of divalent iron species were investigated in a room-temperature molten salt (RTMS) consisting of 1-n-butyl-1-methylpyrrolidinium cation (BMP+) and bis(trifluoromethylsulfonyl)imide (TFSI-) anion. The TFSI--salt of Fe(II) was soluble in BMPTFSI at room temperature. The cyclic voltammetric data for the Fe(III)/ Fe(II) processes at 1.1 V vs. Ag/Ag(I) showed quasi-reversible kinetics on a platinum electrode. The diffusion coefficient of Fe(II) determined by chronoamperometric techniques was 9.7 x 10(-8) cm(2) s(-1) at 25 degrees C. After cathodic reduction of Fe(II) at - 2.0 V, furthermore, metallic Fe was electrodeposited on a copper substrate.

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

The electrochemical behavior of oxygen (O-2)/superoxide ion (O-2(-)) couple was investigated with the aid of the ultramicroelectrode technique in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide (BMPTFSI) room-temperature molten salt (ionic liquid). The diffusion coefficient of O-2 was (1.8 +/- 0.2) X 10(-6) cm(2) s(-1) at 25 degrees C. The activation energy of the diffusion process of O-2 was estimated to be 27 kJ mol(-1) from the temperature dependence of the diffusion coefficient. The solubility of O-2 in BMPTFSI was 14 mmol dm(-3) at 25 degrees C and decreased with an increase in temperature. The diffusion coefficient of O-2(-) was 0.86 X 10(-6) cm(2) s(-1) at 25 degrees C. The formal potential of O-2/O-2(-) couple was 1.13 V vs ferrocene/ferrocenium. (c) 2005 The Electrochemical Society. All rights reserved.

DOI： 10.1149/1.1946530

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記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC INC  

The electrochemical reduction of oxygen was investigated in some hydrophobic room-temperature molten salt systems (ionic liquids) consisting of bis(trifluoromethanesulfone) imide (TFSI(-)) anion with trimethyl-n-hexylammonium (TMHA(+)), 1-butyl-1-methylpyrrolidinium (BMP(+)), 1-ethyl-3-methylimidazolium (EMI(+)) or 1,2-dimethyl-3-propylimidazolium (DMPI(+)) cation. The oxygen dissolved in these melts was reduced to the superoxide ion on a gold electrode. The superoxide ion was stable against the aliphatic and alicyclic organic cations (TMHA(+) and BMP(+)) but reacted with the aromatic ones (EMI(+) and DMPI(+)), suggesting that nucleophilic reagents attack the melts consisting of imidazolium cations. The acceptor number of these TFSI(-)-based molten salt systems was estimated to be comparable to those of acetonitrile and dimethyl sulfoxide from the comparison of the redox potential of O(2)/O(2)(-). The superoxide ion was further reduced, presumably to the peroxide, on a gold electrode in the melts consisting of the aliphatic or alicyclic organic cation. (C) 2003 The Electrochemical Society.

DOI： 10.1149/1.1626669

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担当区分：筆頭著者,　責任著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Electrochemical Society  

DOI： 10.1149/200424.0493pv

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その他リンク： https://syndication.highwire.org/content/doi/10.1149/200424.0493PV

記述言語：英語   掲載種別：研究論文（学術雑誌）   出版者・発行元：ELECTROCHEMICAL SOC JAPAN  

Electrodeposition of metallic lithium has been investigated on a tungsten electrode in 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfone)imide (BMPTFSI) room-temperature molten salt. It was suggested that a passivation film forms on the electrode surface as a result of the reductive decomposition of the organic cation, BMP+. The film obtained in the absence of LiTFSI seems to have no conductivity and reduced further at more negative potential. On the other hand, the film obtained in BMPTFSI containing 1 M LiTFSI seems to have Li+-conductivity and enable the deposition and dissolution of metallic lithium electrochemically. The addition of ethylene carbonate reduced the amount of electric charge required for the formation of the passivation film.

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担当区分：筆頭著者   掲載種別：研究論文（学術雑誌）   出版者・発行元：The Electrochemical Society  

DOI： 10.1149/200219.0640pv

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その他リンク： https://syndication.highwire.org/content/doi/10.1149/200219.0640PV

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）   出版者・発行元：SHANGHAI UNIV  

Electrochemical behavior of ferrocene (Fc) was investigated in the hydrophobic room temperature molten salt systems consisting of bis(trifluoromethanesulfone)imide anions with some quaternary alkylated ammonium cations. The redox reaction of Fc and ferrocenium (Fc(+)) was reversible electrochemically in these molten salt systems. The standard formal potentials of the Fc(+) / Fc couple were determined against a silver(l) / silver electrode. The electrochemical potential windows of these systems were determined against formal potentials of the Fc(+) / Fe couple. The electrochemical potential windows of these systems were narrower than those of some aprotic organic solvent systems. It was suggested that the cathodic decomposition potentials of these molten salt systems were determined mainly by the adiabatic electron affinity of the quaternary alkylated ammonium cations.

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J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap

記述言語：日本語  

J-GLOBAL

researchmap