Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (03): 406-410.doi: 10.3866/PKU.WHXB20090302

• ARTICLE • Previous Articles     Next Articles

Influence of Temperature on the Performance of a Graphite Electrode

 ZHUANG Quan-Tiao, WEI Guo-Zhen, DONG Quan-Feng, SUN Shi-Gang   

  1. School of Materials Science and Engineering, China University of Mining&Technology, Xuzhou 221116, Jiangsu Province, P. R. China; State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P. R. China
  • Received:2008-09-24 Revised:2008-12-15 Published:2009-03-02
  • Contact: ZHUANG Quan-Chao; SUN Shi-Gang E-mail:zhuangquanchao@126.com;sgsun@xmu.edu.cn

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Abstract:

The first lithiation of a graphite electrode in 1 mol·L-1 LiPF6-EC (ethylene carbonate):DEC(diethyl carbonate):DMC(dimethyl carbonate) electrolyte at 25 and 60 ℃, and in 1 mol·L-1 LiPF6-EC:DEC:DMC+5% VC (vinylene carbonate) electrolyte at 60 ℃ were investigated by electrochemical impedance spectroscopy (EIS) combined with cyclic voltammetry (CV). It was found that deterioration of the graphite electrode's electrochemical performance was mainly caused by the unstable solid electrolyte interphase (SEI) film on the electrode's surface in 1 mol·L-1 LiPF6-EC:DEC:DMC electrolyte at 60 ℃. However, the use of VC as an additive to the above electrolyte significantly improved the electrochemical performance of the graphite electrode, which was attributed to an improvement in the stability of the SEI filmthat formed on the graphite electrode's surface.

Key words: Lithium ion battery, Graphite electrode, Electrochemical impedance spectroscopy, SEI film