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采用锂离子电池聚乙烯(PE)隔膜为基体,在其两侧均匀涂覆厚度为12μm混有纳米氧化铝(Al2O3)粉末及胶凝剂的无机有机浆体,得到一种无机复合陶瓷涂层锂离子电池隔膜。通过对该电池隔膜及由此类隔膜制成的电池进行热烘箱测试结果表明:在150℃高温环境下,无机陶瓷涂层隔膜没有出现较大的热收缩,具有优越的热稳定性,能有效提高锂离子电池的热安全性能。由于无机纳米Al2O3颗粒具有较高的比表面积,使得涂覆后的隔膜对电解液具有良好的润湿性及保液性能。采用陶瓷涂层隔膜组装LiFePO4-C体系电池并对电池进行1C充放电循环测试,结果表明涂覆后的隔膜能有效提高锂离子电池的容量保持性能。
Abstract：Ceramic-coating separators were prepared by coating both sides of porous polyethylene(PE)membranes with organic-inorganic slurries,which were mixed with aluminum oxide(Al2O3)power and gelling.After baking at 150℃ in oven,the ceramic-coating separators exhibited no significant thermal shrinkage,which indicated that the thermal stability was improved compared to traditional polymer separators at high temperature.Due to the large surface area of the small ceramic particles,the separators showed good wettability and retention in electrolytes.Li-ion cells made with LiFePO4 cathode and a carbon anode were assembled by using the ceramiccoating separators.The cyclic performance of Li-ion cells charged-discharged at 1C was studied,and it was proved that the Li-ion cells assembled with polyethylene membrane had better capacity retention.
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基本信息:
中图分类号:TM912.9
引用信息:
[1]姚汪兵,陈萍,周元,等.陶瓷涂层隔膜对锂离子电池性能影响[J].电池工业,2013,18(Z2):124-127.
2013-08-25
2013-08-25