Ionic liquids with low melting points and their application to double-layer capacitor electrolytes

被引：107

作者：

Ue, M ^{[1
]}

Takeda, M ^{[1
]}

Takahashi, T ^{[1
]}

Takehara, M ^{[1
]}

机构：

[1] Mitsubishi Chem Corp, Sci & Technol Res Ctr, Electrochem Lab, Ibaraki 3000332, Japan

来源：

ELECTROCHEMICAL AND SOLID STATE LETTERS | 2002年 / 5卷 / 06期

关键词：

D O I：

10.1149/1.1472255

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Ionic liquids, 1-ethyl-3-methylimidazolium hexafluorotantalate (EMITaF6) and hexafluoroniobate (EMINbF6) were synthesized by a new method. They showed lower melting points and higher decomposition temperatures than popular EMIBF4 due to larger anion size. Electrolytic conductivities of these ionic liquids were about 6 mS cm(-1) at 25degreesC. Lowering the melting point of ionic liquids did not result in the improvement of low-temperature characteristics of carbon double-layer capacitors, however, the new ionic liquids showed long life compared with EMICF3SO3, EMI(CF3SO2)(2)N, and EMI(C2F5SO2)(2)N at 3.0 V, 70degreesC. The derivatives of the new ionic liquids having a methyl group in 2-position (1-ethyl-2,3-dimethylimidazolium salts) were not ionic liquids at room temperature. (C) 2002 The Electrochemical Society.

引用

页码：A119 / A121

页数：3

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