锂离子电池用聚烯烃隔膜涂覆的研究进展

Present Situation of Polyolefin Separator for Lithium Ion Battery

聚烯烃隔膜目前以聚乙烯和聚丙烯材料为主,此类材料本身存在耐温性差的缺点,且作为非极性材料,其对电解液的吸液保液性不好。通过在隔膜基膜上涂布Al_(2)O_(3)、PVDF-HFP、芳纶等材料,能提高隔膜热稳定性、吸液保液性、极片粘结力,从而提高电池安全性、能量密度、倍率放电、循环寿命等。本文通过归纳整理,介绍了各类涂覆材料的机理,介绍了目前改善隔膜性能的方法以及隔膜涂覆研究的方向。

At present,polyolefin diaphragms are mainly made of polyethylene and polypropylene.Such materials have the disadvantage of poor temperature resistance,and as non-polar materials,they have poor liquid absorption and retention of electrolyte.By coating Al_(2)O_(3),PVDF-HFP,aramid and other materials on the diaphragm base film,the thermal stability,liquid absorption and liquid retention of the diaphragm and the adhesion of the electrode can be improved,so as to improve the battery safety,energy density,rate discharge,cycle life,etc.This paper introduces the mechanism of various coating materials,the methods to improve the performance of diaphragm and the research direction of diaphragm coating.