Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (11): 2641-2647.doi: 10.3866/PKU.WHXB201207181

• ELECTROCHEMISTRY AND NEW ENERGY • Previous Articles     Next Articles

Novel Organosilicon Ionic Liquid Based Electrolytes for Supercapacitors

ZhONG Hao-Xiang, ZHAO Chun-Bao, LUO Hao, ZHANG Ling-Zhi   

  1. Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, P. R. China
  • Received:2012-07-02 Revised:2012-07-18 Published:2012-10-17
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (50973112); Science and Technology Plan Project of Guangzhou Municipality, China (11A44061500); Chinese Academy of Sciences -Guangdong Collaboration Program (2010(8)); and the Hundred Talents Program of Chinese Academy of Sciences (CAS).

Abstract:

A novel room temperature organosilicon ionic liquid (SiN1IL) was synthesized and its chemical structure and electrochemical window were characterized. The ionic conductivity of SiN1IL/propylene carbonate (PC)/acetonitrile (AN) solution was 19.6 mS·cm-1, comparable with the commercial electrolytes currently used in supercapacitors. The electrochemical performance of the cells using activated carbon as electrodes and SiN1IL-based formula with PC/AN as electrolytes was systematically evaluated. SiN1IL/PC electrolyte exhibited superior rate capability and lower impedance compared to a conventional electrolyte (tetraethylammonium tetrafluoroborate (Et4NBF4)/PC). Upon applying a working voltage of 2.7 V, the SiN1IL/PC cell had a specific capacitance of 108 F·g-1 at a current density of 1000 mA·g-1.

Key words: Organosilicon, Ionic liquid, Supercapacitor, Electrolyte, Activated carbon

MSC2000: 

  • O646