Ionic liquid-based electrolytes for capacitor applications

被引:78
作者
Zhu, Qing [1 ]
Song, Ye [1 ]
Zhu, Xufei [1 ]
Wang, Xinlong [1 ]
机构
[1] Nanjing Univ Sci & Technol, Chem Engn Inst, Nanjing 210094, Jiangsu, Peoples R China
关键词
ionic liquid; electrolyte; conductivity; sparking voltage; capacitor;
D O I
10.1016/j.jelechem.2006.11.016
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
In this work we have synthesized several novel ionic liquids (ILs) based on imidazolium/pyrrolidinium cations and maleate/phthalate anions. The 1.5 mol/L solutions of the ILs in gamma-butyrolactone (GBL) solvent were prepared as the electrolytes of electrochemical energy storage devices such as electrochemical capacitors and electrolytic capacitors. The conductivity, electrochemical stability, sparking voltage and thermal stability of these electrolytes have been investigated systematically in this work. The relatively high room temperature conductivity (up to 18.22 mS cm(-1)), wide electrochemical window (up to 3.6 V) and good high-temperature durability of the 1-ethyl-3-methylimidazolium and N,N'-dimethylpyrrolidinium cation-based electrolytes make them attractive for capacitor applications. In addition, these types of electrolytes could only be utilized in low-voltage type electrolytic capacitors due to their comparatively low sparking voltage (similar to 100 V). The temperature dependence of conductivity was also discussed in this study. The Vogel-Tammann-Fulcher (VTF) equation accurately describes the dependence of conductivity on temperature. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:229 / 236
页数:8
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