摘要
以N,N-二甲基甲酰胺为溶剂,水为非溶剂经相转移制备聚偏氟乙烯-六氟丙烯聚合物电解质,用扫描电子显微镜、交流阻抗和线性扫描对所制聚合物膜进行表征.实验结果表明:相转移法制得的微孔膜孔隙丰富,吸液率可达480%,电化学稳定窗口为5.5 V,浸取电解液后室温离子电导率为4.7 mS·cm-1;以LiCoO2为正极制得的聚合物电池0.2 C充放电,首次放电平台为3.85 V以上,放电容量为133.5 mA·h·g-1,循环过程中充放电效率高于98%,50次循环后容量保持为130 mA·h·g-1,以0.5 C和1 C放电时分别能保持0.1 C放电容量的94%和92%.
A polymer electrolyte based on poly（vinylidene） fluoride-hexafluoropropylene was prepared by phase inversion using dimethyl formamide as solvent and H20 as non-solvent, its morphology and electrochemical properties were studied by scanning electron microscopy, a.c impedance and linear sweep voltammetry test. The experiment results show that： this microporous polymer membrane exhibits 480% uptake of electrolyte solution and electrochemical stability of above 5.5 V. After absorbing electrolyte of 1 mol.L^-1 LiPF6-ethylene carbonate/diethyl carbonate/dimethyl carbonate, the ionic conductivity at room temperature reaches 4.7 ms.cm^-1. The polymer Lithium battery using LiCoO2 as cathode material displays an initial discharge capacity of 133.5 mA.h.g^-1 and discharge plateau of 3.85 V at 0.2 C current rate. After 50 cycles, its discharge capacity is still 130 mA.h.g^-1. When discharging at 0.5 C and 1 C current rate, it can retain 94% and 92% of the discharge capacity of 0.1 C respectively.
出处
《湖南城市学院学报（自然科学版）》
CAS
2008年第3期51-54,共4页
Journal of Hunan City University:Natural Science
基金
国家高技术研究发展计划项目(2003AA32X010)
湖南省自然科学基金重点项目(06B0023)
关键词
聚合物电解质
锂离子电池
相转移
离子电导率
Polymer electrolyte
Li-ion battery
phase inversion
ionic conductivity
