动力锂离子电池隔膜的研究进展

A Review on the Separator for Power Li ion Batteries

关键词:  动力锂离子  电池隔膜  湿法非织造布  耐高温性能  复合膜

Key Words:power li-ion  batteries separator  wet-laid nonwovens  high thermal tolerance  multi-layer separator

摘要:针对动力锂离子电池对隔膜的要求,综述了几种常见的制备方法及其隔膜的性能,重点介绍了不同制备方法的新进展。可以通过不同熔点聚合物的多层复合以及寻找更好的耐高温材料来提高拉伸膜的耐高温性能。溶剂共混和添加无机颗粒可以改善以静电纺丝为代表的干法非织造隔膜的力学性能。超细纤维的复配用以控制湿法非织造隔膜的孔径大小及其分布。复合膜作为一种新型的动力锂电隔膜,展现出了良好的均一性、低的热收缩率以及较好的耐高温性能。核心在于寻找合适的复合手段和把不同复合材料协同优势发挥到最大化。

Abstract:The common preparation methods of separator for power li-ion battery and the reparatory properties were reviewed in this paper. New progress of different preparation methods was highlighted. Using polymer mixtures with different melting temperatures, as well as using polymers with better thermal tolerance can improve the shutdown and meltdown temperatures of the stretch film. The mechanical property of electrospinning separators can be improved by mixing solvent and adding inorganic particles. For wet-laid nonwoven reparator, pore size and pore size distribution can be controlled by using microfibers. Multi-layer separator as a new power lithium battery separator, exhibits great advantages in uniformity, low thermal shrinkage and high thermal tolerance. The key is to find appropriate composite methods to maximize the synergistic advantages of the different materials.