Temperature-responsive microspheres-coated separator for thermal shutdown protection of lithium ion batteries
Temperature-responsive microspheres-coated separator for thermal shutdown protection of lithium ion batteries
复制标题
用于锂离子电池热关断保护的温度响应型微球涂层隔膜
DOI：
10.1039/c4ra11500g
复制
发表时间：
2015-01-01
期刊：
影响因子：
3.9
通讯作者：
Ai, Xinping
中科院分区：
文献类型：
--
作者：
Ji, Weixiao;Jiang, Bolun;Ai, Xinping
安全问题严重阻碍了高容量和高倍率锂离子电池（LIB）在电动汽车和可再生能源发电站中的商业应用。热失控是锂离子电池在极端条件下发生危险行为的主要原因。通过在聚烯烃薄膜上包覆热塑性乙烯-醋酸乙烯共聚物（伊娃）微球，研制了一种新型热关断隔膜，其关断温度可达90 °C左右，并对锂离子电池（LIB）进行了热保护试验。实验结果表明，由于伊娃涂层在临界温度下熔化，该隔膜可以迅速切断电极之间的Li+传导，从而关闭电池反应，从而保护电池免受热失控。此外，这种类型的隔膜对正常电池性能没有负面影响，因此为商业LIB的安全控制提供了内部和自我保护机制。
Safety issues have severely retarded the commercial applications of high-capacity and high-rate lithium ion batteries (LIBs) in electric vehicles and renewable power stations. Thermal runaway is a major cause for the hazardous behaviors of LIBs under extreme conditions. In this paper, a new thermal shutdown separator with a more reasonable shutdown temperature of ∼90 °C is developed by coating thermoplastic ethylene-vinyl acetate copolymer (EVA) microspheres onto a conventional polyolefin membrane film and tested for thermal protection of lithium-ion batteries (LIBs). The experimental results demonstrate that owing to the melting of the EVA coating layer at a critical temperature, this separator can promptly cut off the Li+ conduction between the electrodes and thus shut down the battery reactions, so as to protect the cell from thermal runaway. In addition, this type of the separator has no negative impact on the normal battery performance, therefore providing an internal and self-protecting mechanism for safety control of commercial LIBs.