具有热关断涂层的锂电池隔膜性能表征

介绍了一种具有热关断涂层的锂电池功能隔膜，利用热关断涂层的耐热特点来降低隔膜的热闭孔温度，当电池内部达到一定的温度时，涂层迅速熔化并覆于极片和隔膜之间，形成绝缘层，阻止锂离子的进一步传输，从而提高锂离子电池的安全性. 实验表明，热关断涂层表观均匀，对电池的内阻、倍率性能和循环性能没有不良影响. 电池的安全测试表明，该功能隔膜可表现出优异的安全防护作用.

Characterization of the Separator with Thermal-Shutdown Layer for Use in Lithium Batteries

In this paper, the lithium ion battery coated with the thermal-shutdown functional layer has been introduced. The shutdown temperature of the separator could be decreased by using the melting point of thermal-shutdown functional layer. When the internal battery environment reached a critical temperature, the functional layer melted and coated the anode/separator with a non-conductive barrier, halting Li-ion transport and shutting down the cell permanently. The results showed that the functional layer did not affect the resistance, rate performance and cycle life. It was found the functional layer can significantly improve the safety of the battery when misused.