物理化学学报 >> 2010, Vol. 26 >> Issue (05): 1233-1238.doi: 10.3866/PKU.WHXB20100530

电化学 上一篇    下一篇

离子液体/凝胶聚合物电解质的制备及其与LiFePO4的相容性

崔闻宇, 安茂忠, 杨培霞   

  1. 哈尔滨工业大学化工学院, 哈尔滨 150001
  • 收稿日期:2009-10-14 修回日期:2010-01-04 发布日期:2010-04-29
  • 通讯作者: 安茂忠 E-mail:mzan@hit.edu.cn

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

摘要:

以1-甲基-3-乙基咪唑六氟磷酸盐(EMIPF6)、聚偏氟乙烯-六氟丙烯(P(VDF-HFP))和六氟磷酸锂(LiPF6)为原料, 采用溶液浇铸法制备了离子液体/凝胶聚合物电解质(ILGPE). 通过循环伏安(CV)、计时电流法、恒流充放电、电化学阻抗法(EIS)研究了该电解质的离子传输特性以及与锂离子电池正极材料LiFePO4的相容性. 结果表明, 离子液体/凝胶聚合物电解质的室温电导率为1.650×10-3 S·cm-1, 电化学稳定窗口达到5.0 V. 在充放电循环过程中, 电极表面形成的钝化膜改善了锂离子脱、嵌可逆性和电极/电解质的界面性质.

关键词: 锂离子电池, 离子液体/凝胶聚合物电解质, EMIPF6, 正极材料, 相容性

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