锂离子电池隔膜的发展现状与进展

Development status and progress of lithium ion battery separator

锂电池隔膜是锂离子电池的重要组成部分,对整个电池的安全及性能有显著影响。目前国内国产化步伐加快,在锂电池隔膜方面已有明显的成果进步,市场占有率和产能都位居世界前列,但高端隔膜市场却依旧被国外公司垄断,因此,为进一步提高高端化市场的国产化率,仍需加大锂电隔膜的研究力度。本文主要针对电池隔膜在电池中的主要作用、种类、性能差异及优缺点,详细阐述了相应的国内外研究和进展,同时还概括了锂电池隔膜的制备工艺方法等,包括湿法和干法制备工艺。对隔膜的种类以及不同的改性方法进行了概述,包括不同改性方法导致的隔膜性能上的差异,并以几种商业隔膜和纤维素纸基隔膜为例,进行了性能对比。最后对锂电池隔膜在工艺、新型锂电池隔膜发展以及研究方向等方面的未来发展趋势进行了总结展望。

Separator is an important part of lithium ion battery,which significantly impact the safety and performance of the whole battery.At present,the pace of localization in China is accelerating,and there are obvious achievements and progress in the area of lithium-ion battery separators.The market share and production capacity in China are in the forefront of the world,but the high-end diaphragm market is still monopolized by foreign companies.Therefore,in order to further increase the localization rate of the highend market,it is still necessary to strengthen the research on lithium-ion battery separators.This paper mainly expounds the main functions,types,performance differences,advantages and disadvantages of various battery separators,and the corresponding development status and progress.At the same time,the preparation process of lithium battery separators is described in detail.The types of diaphragms and different modification methods are summarized,including the differences in diaphragm performance caused by different modification methods,and the performances of several commercial separators and cellulose paper-based separators are compared.Finally,the future developments of lithium battery separator are summarized and prospected.