Research progress on high-temperature resistant polymer separators for lithium-ion batteries

Lithium-ion batteries (LIBs) quickly occupy an absolute leading position in the secondary battery market since their commercialization. However, the performance of LIBs is poor at high temperatures, resulting in local overheating and internal thermal fluctuation, such as fire and explosion. As a vital portion of LIBs, the separator is critical to the thermal sustainability of LIBs. The primary requirements of high-temperature LIB separators are high thermal stability and minimum thermal shrinkage. In this paper, the classification, requirements, characterization methods, and manufacturing process of LIB separators are introduced, and the high-temperature resistant modification and emerging heat stable polymer separators of commercial separators in recent years are reviewed. The future development prospects and challenges of high-temperature LIB separators are also forecasted. .