辐射现场聚合的锂离子电池隔膜  

Lithium ion battery membrane prepared in-site by radiation

作　　者：王洪[1,2] 邓璋琼[1] 孙家珍[3] 

机构地区：[1]绵阳师范学院化学与化学工程学院 [2]中国科学院长春应用化学研究所长春130022 [3]中国科学院长春应用化学研究所

出　　处：《辐射研究与辐射工艺学报》2008年第4期199-203,共5页Journal of Radiation Research and Radiation Processing

基　　金：四川教育厅重点基金项目(07ZA159)资助

摘　　要：为了寻找比传统聚烯烃微孔膜性能更好的可用于锂离子电池的隔膜,对Al2O3/SiO2/PAN(聚丙烯腈)复合隔膜进行了研究,PAN采用60Coγ辐射现场引发聚合生成。膜中Al2O3/SiO2的两性特征,将电解液中的酸性HF(氟化氢)消耗掉,而HF作为现在锂离子电池所用电解液中的杂质是不可避免的。复合膜作为隔膜制备的碳/正极材料锂离子电池不仅具有优良的容量保持性、高温安全性,也显示良好的倍率放电性和耐过充电保护性能。Al2O3/SiO2/PAN composite membrane was prepared as the separator for Li-ion batteries in order to replace the traditional microporous polyolefin membrane. PAN was polymerized by irradiation of ^60Co γ-ray. The composite membrane has high porosity, and can be well wetted by liquid electrolyte. The amphoteric character of Al2O3/SiO2 can scavenge acidic hydrogen fluoride, which is inevitably present in the LiPF6-based electrolytes used currently in the Li-ion batteries. With the composite membrane as a separator, the graphite/cathode cell exhibited good capacity retention. It is also found that the Li-ion cell fabricated in this manner not only has stable capacity retention, high temperature safety, but also shows good high-rate performance and overcharge proof performance.

关 键 词：辐射 隔膜 锂离子电池 离子电导 循环性能 

分 类 号：TM2[一般工业技术—材料科学与工程] TG15[电气工程—电工理论与新技术]