【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。更多还原

【Abstract】 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 re-tention, high temperature safety, but also shows good high-rate performance and overcharge proof performance.更多还原