Acta Phys. -Chim. Sin. ›› 2010, Vol. 26 ›› Issue (05): 1233-1238.doi: 10.3866/PKU.WHXB20100530

• ELECTROCHEMISTRY • Previous Articles     Next Articles

Preparation of an Ionic Liquid Gel Polymer Electrolyte and Its Compatibility with a LiFePO4 Cathode

CUI Wen-Yu, AN Mao-Zhong, YANG Pei-Xia   

  1. School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, P. R. China
  • Received:2009-10-14 Revised:2010-01-04 Published:2010-04-29
  • Contact: AN Mao-Zhong E-mail:mzan@hit.edu.cn

Abstract:

An ionic liquid gel polymer electrolyte (ILGPE) based on 1-ethyl-3-methyl-imidazoliumhexafluorophosphate (EMIPF6), poly(vinylidenefluoride-hexafluoropropylene) (P(VDF-HFP) and LiPF6 was prepared by a solution casting method. Its ion transport characteristics and compatibility with LiFePO4 were investigated by cyclic voltammetry (CV), chronoamperometry, galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS). The results show that the ionic conductivity and electrochemical window at room temperature are 1.650×10-3 S·cm-1 and 5.0 V, respectively. The lithiation/delithiation reversibility was improved because of the formation of a passivation layer on the surface of the electrode during the charge-discharge cycles.

Key words: Lithium-ion battery, Ionic liquid gel polymer electrolyte, EMIPF6, Cathode materials, Compatibility

MSC2000: 

  • O646