无机涂层改善锂离子电池聚烯烃隔膜性能研究-无机材料学报.PDF

第 28 卷 第 12 期 无 机 材 料 学 报 Vol. 28 No. 12 2013 年 12 月 Journal of Inorganic Materials Dec., 2013 文章编号: 1000-324X(2013)12-1296-05 DOI: 10.3724/SP.J.1077.2013.13214 无机涂层改善锂离子电池聚烯烃隔膜性能研究 赵丽利, 朱永平, 王学营 ( 中国科学院 过程工程研究所, 多相复杂系统国家重点实验室, 北京 100190) 摘 要: 为了提高锂离子电池用聚烯烃微孔膜的综合性能, 在商用 Celgard 膜表面涂布 ZrO2 无机涂层, 粘结剂选 用电池用聚偏氟乙烯。对比分析涂覆前后的隔膜发现, ZrO2 涂层可以显著提高 Celgard 膜的热尺寸稳定性和热熔 化温度, 对提高锂离子电池安全性起到积极作用。同时无机涂层还能明显改善隔膜对电解液的浸润性, 复合隔 膜具有更好的保液能力, 以涂有ZrO2 涂层的 Celgard 膜作为隔膜组装锂离子电池, 可以显著提高长期充放电循环 时电池容量保持率。 关 键 词: ZrO2 涂层; 锂离子电池; 隔膜; 性能 中图分类号: TB332 文献标识码: A Inorganic Layer Coated Polyolefin Separator with High Performances for Lithium-ion Batteries ZHAO Li-Li, ZHU Yong-Ping, WANG Xue-Ying (State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Bei- jing 100190, China) Abstract: Inorganic layer-coated separator was prepared by coating the sides of a porous polyolefin membrane with ZrO2 powder and polyvinylidene fluoride binder. The composite separator exhibits improved thermal stabil- ity at high temperatures without significant thermal shrinkage. Moreover, the separator has higher melt tempera- ture. It is expected that the ZrO2-coated separator in this study can be potential candidate as a separator for re- chargeable lithium-ion batteries that require thermal safety. Due to the high hydrophilicity of the ZrO2 powder and large surface area of the small particles, the se