摘要
以N,N-二甲基甲酰胺为溶剂,聚偏氟乙烯-六氟丙烯为聚合物基质,采用直接挥发溶剂法制备正极自支撑的聚合物电解质,并以锂为负极制备LiCoO2聚合物电池.用扫描电子显微镜和循环伏安实验对聚合物电解质进行表征,用红外光谱分析了电解质微孔的形成机理,并对聚合物电池的充放电性能和界面阻抗进行测试。结果表明:直接挥发溶剂制得的聚合物电解质孔穴丰富,电化学稳定窗口达5.5 V.采用正极自支撑电解质可改善材料的力学性能,降低电池的界面阻抗;制备的聚合物电池界面性质稳定,循环40次后容量保持率为97.5%,0.5C和1C倍率放电分别能保持0.1C放电容量的97.8%和95.7%.
A poly（vinylidene） fluoride-hexafluoropropylene electrolyte supported by the cathode electrode was prepared by evaporating the solvent of dimethyl formamide, and polymer lithium-ion batteries were assembled by using lithium foil as anode and LiCoO2 as cathode material. Polymer membrane was characterized by scanning electron microscopy and cyclic voltammetry test, the formation mechanism of micropore was discussed by infrared spectroscopy, and the polymer battery＇s electrochemical properties and resistance were tested by charge-discharge experiment and A.C. impedance. The results show that this polymer membrane has rich micropore and its electrochemical stability window reaches 5.5 V. The polymer electrolyte supported by cathode electrode has excellent mechanical property and can reduce the interfacial impedance of polymer battery. Polymer lithium battery keeps a stable interfacial property, and its capacity retention is 97.5% after 40 cycles. The discharge capacities of 0.5 C and 1C are 97.8% and 95.7% of the discharge capacity of 0.1 C, respectively.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2007年第2期256-261,共6页
Journal of Central South University:Science and Technology
基金
国家高技术研究发展计划资助项目(2003AA32X010)
关键词
聚合物电解质
锂离子电池
交流阻抗
界面行为
聚偏氟乙烯-六氟丙烯
polymer electrolyte
lithium battery
A.C. impedance
interfacial behavior
poly（vinylidene） fluoride-hexafluoropropylene
