Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (10): 1164-1168.doi: 10.3866/PKU.WHXB20051021

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Capacitance Characteristics of Carbon Nanotubes in Room Temperature Molten Salt Electrolyte

XU Bin; WU Feng; CHEN Ren-jie; CHEN Shi; WANG Guo-qing   

  1. School of Chemical Engineering & Environment, Beijing Institute of Technology, Beijing 100081; Institute of Chemical Defense, Beijing 100083
  • Received:2005-02-04 Revised:2005-04-08 Published:2005-10-15
  • Contact: WU Feng

Abstract: Capacitance characteristics of carbon nanotubes (CNTs) in room temperature molten salt (RTMS) electrolyte of LiTFSI-acetamide were investigated. Cyclic voltammetry (CV) and galvanostatic charge/discharge measurements were employed to investigate the electrochemical performance of the test cells composed of a pair of carbon nanotubes electrodes and RTMS as electrolyte. The CNTs exhibited typical capacitance behavior in LiTFSI-acetamide, and a high specific capacitance of 22 F•g-1 estimated from galvanostatic discharge was obtained. The working voltage of the test cells could reach at 2.0 V, and they also showed a practical good level of durability over cycles of charge and discharge. After 1000 charge and discharge cycles, the capacity loss was just 10% of the initial discharge capacity. The preliminary results suggest that RTMS is a kind of promising electrolyte for supercapacitors.

Key words: Carbon nanotubes, Room temperature molten salt, Capacitance