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http://dx.doi.org/10.5229/JKES.2002.5.4.192

Application of Ionic Liquids Based on 1-Ethyl-3-Methylimidazolium Cation and Fluoroanions to Double-Layer Capacitors  

Ue, Makoto (Mitsubishi Chemical Corporation, Science & Technology Research Center, Electrochemistry Laboratory)
Takeda, Masayuki (Mitsubishi Chemical Corporation, Science & Technology Research Center, Electrochemistry Laboratory)
Publication Information
Journal of the Korean Electrochemical Society / v.5, no.4, 2002 , pp. 192-196 More about this Journal
Abstract
Ionic liquids based on l-ethyl-3-methylimidazolium cation $(EMI^+)$ and inorganic or organic anions containing fluorine atoms were applied to electrolyte materials for double-layer capacitors. The double-layer capacitors composed of a pair of activated carbon electrodes and an ionic liquid selected from $EMIBF_4,\; EMINbF_6,\;EMITaF_6,\;EMICF_3SO_3,\;EMI(CF_3SO_2)_2N,\;and\;EMI(C_2F_5SO_2)_2N$ showed inferior low-temperature characteristics to those of a conventional nonaqueous electrolyte based on propylene carbonate (PC) solvent. On the other hand, the capacitor using $EMIF{\cdot}2.3HF$ showed excellent low-temperature characteristics due to its high conductivity at low temperatures, however, it had a lower working voltage $(\~2V)$ than the conventional nonaqueous counterpart $(\~3V)$.
Keywords
Ionic liquid; I-Ethyl-3-Methylimidazolium; Fluoroanion; Double-layer capacitor; Electrolyte material;
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