摘要
研究了以PP/PE/PP(聚丙烯/聚乙烯/聚丙烯)膜为支撑体,P(VDF-HFP)(聚(偏二氟乙烯-六氟丙烯))-PMMA(聚甲基丙烯酸甲酯)为聚合物基体,与纳米级SiO2、CaCO3进行复合构成的聚合物电解质膜(CPE)的性能。借助X射线衍射、电化学阻抗、电池的首次充放电、倍率放电和充放电循环测试,考察了复合聚合物电解质CPE(SiO2)和CPE(CaCO3)的结构以及它们与LiFePO4正极材料、金属锂的相容性。结果表明:无机粒子的加入没有改变原来聚合物P(VDF-HFP)-PMMA非晶结构;两种电解质构成的电池的首次充放电性能相差不大,但是循环性能后者优于前者;LiFePO4/CPE(CaCO3)/Li构成的电池的倍率放电性能、放电容量和容量保持率均优于LiFePO4/CPE(SiO2)/Li电池;CPE(CaCO3)与LiFePO4、金属锂的相容性更好。
Performance of composite polymer electrolytes（CPEs）,prepared by adding nano-scale SiO2 and CaCO3 respectively on P（VDF-HFP）-PMMA polymer matrix supported by PP/PE/PP membrane was investigated.By using X-ray diffractometry（XRD）,electrochemical impedance spectroscopy（EIS）,charge-discharge cycle,and discharge at different rates,structure of CPE（SiO2） and CPE（CaCO3） and their compatibility with LiFePO4 cathode and metal Li anode materials were was studied. Results show that the CPEs are still amorphous structure as the original polymer base.The initial charge-discharge behavior of the batteries made from the two CPEs has no obvious difference.However,the LiFePO4/CPE（CaCO3） /Li battery has superior high rate discharge ability,discharge capacity stability as well as cycling performance.Compatibility of CPE（CaCO3） with both LiFePO4 and metal Li is better than that of CPE（SiO2）.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2009年第5期679-682,共4页
Journal of Materials Science and Engineering
