复合凝胶聚合物电解质的制备及电化学性能

Elect rochemical P ropert ies and Preparation#br# of Composi te Gel Polymer Electroly te

辽宁石油化工大学石油化工学院

School of Petrochemical Engineering, Liaoning Shihua University, Fushun Liaoning 113001, P.R.China

关键词: 聚偏氟乙烯-六氟丙烯 , 复合凝胶聚合物电解质 , 离子导电率 , 锂离子电池

The composite gel polymer electrolyte (CGPE) with high ionic conductivity was prepared, in which poly(vinylidene fluoride-hexafluoropropylene (PVDF-HFP) served as the based polymer, polymethyl methacrylate (PMMA) as the blending agent, LiPF6 as the conducting salt, and polyvinylpyrrolidone (PVP) as the plasticizer. The structures were characterized by using IR, the ionic conductivity was determined by AC impedance, and the electrochemical stability was measured by linear sweep voltammetry. The charge-discharge properties of the Li-ion batteries in which the CGPE served as membrane were investigated．The results show that the CGPE conductivity is more than 10-3S/cm, and electrochemical window is stable under 4.65 V when 20% PMMA was mixed. When using LiFePO4 as the cathode material, the initial discharge capacities of Li-ion cell in the CGPE were 138 and 98.3 mAh/g at 0.1 C and 0.2 C rate respectively. 

辽宁省自然科学基金资助项目(20082187)

10.3696/j.issn.1006-396X.2011.03.007