Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (02): 201-206.doi: 10.3866/PKU.WHXB20090201

• ARTICLE • Previous Articles     Next Articles

Effect of Fluoroethylene Carbonate Additive on the Performance of Lithium Ion Battery

XU Jie; YAO Wan-Hao; YAO Yi-Wen; WANG Zhou-Cheng; YANG Yong   

  1. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Provine, P. R. China
  • Received:2008-09-10 Revised:2008-10-21 Published:2009-01-16
  • Contact: WANG Zhou-Cheng

Abstract: Fluoroethylene carbonate (FEC) with a volume ratio of 2%was added to the electrolyte containing 1 mol·L-1 LiPF6 in ethylene carbonate (EC), dimethyl carbonate (DMC), and methyl ethyl carbonate (EMC) (1:1:1 by volume). The effects of FEC on lithiumion battery performance and on the mesocarbon microbead (MCMB) electrode/electrolyte interphase were studied by cyclic voltammetry (CV), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and electrochemical impedance spectroscopy (EIS). The results indicated that the application of a 2% (volume ratio) of FEC suppressed electrolyte decomposition and caused the formation of an excellent solid electrolyte interphase (SEI) film on the MCMB electrode. The battery resistance decreased while the specific capacity and cyclic stability of the battery increased.

Key words: Additive, Fluoroethylene carbonate, Lithiumion battery, Cyclic voltammetry, Energy dispersive spectroscopy, Electrochemical impedance spectroscopy