Comparative studies on electrochemical cycling behavior of two different silica-based ionogels

JOURNAL OF POWER SOURCES

卷:301

Article

Wang, Shuang^1,2  Hsia, Ben¹  Alper, John P.¹  Carraro, Carlo¹  Wang, Zhe²  Maboudian, Roya¹ 

[1] Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA

[2] Changchun Univ Technol, Adv Inst Mat Sci, Changchun 130012, Peoples R China

关键词: Ionogel;    Electrochemical test;    Long-term stability;    High-temperature solid-state;    electrochemical systems;    Battery;    Electrochemical sensor;   

DOI  :  10.1016/j.jpowsour.2015.09.121

来源: Elsevier

【 摘 要 】

We report a comparative study of two silica-based ionogel electrolytes for electrochemical cycling applications. The ionogels considered represent two classes of gel networks, a covalently formed network generated by the polymerization of tetramethoxysilane catalyzed by formic acid, and a network formed by weak intermolecular forces obtained by mixing fumed silica nanopowder with ionic liquid. In both cases, 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide is utilized as the ion conductor in the gel network. With increasing temperature it is shown that the electrochemical stability window is reduced, the conductivity of the electrolyte is increased, and the double layer capacitance is increased for both types of ionogels. Long-term stability of the two ionogels is excellent, with 90% capacitance retained after 10,000 repetitive CV cycles at 100 degrees C. Our results indicate that both of these ionogel electrolytes are promising for application in solid-state electrochemical systems at high temperature. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free