Citation: CUI Wen-Yu, AN Mao-Zhong, YANG Pei-Xia. Preparation of an Ionic Liquid Gel Polymer Electrolyte and Its Compatibility with a LiFePO4 Cathode[J]. Acta Physico-Chimica Sinica, 2010, 26(05): 1233-1238. doi: 10.3866/PKU.WHXB20100530
离子液体/凝胶聚合物电解质的制备及其与LiFePO4的相容性
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.
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关键词:
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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
English
Preparation of an Ionic Liquid Gel Polymer Electrolyte and Its Compatibility with a LiFePO4 Cathode
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.
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Key words:
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Lithium-ion battery
- / Ionic liquid gel polymer electrolyte
- / EMIPF6
- / Cathode materials
- / Compatibility
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