膜科学与技术

熔喷法制备优异热阻隔性能的锂离子电池隔膜

作者：王健b，温乐乐b，秦德君b，卢林c，刘彬彬a，薛立新ab

单位：（a中国浙江工业大学之江学院，特种纤维材料研制和应用创新中心，绍兴，浙江312030）（b中国科学院宁波材料技术与工程研究所，中科院海洋新材料和应用技术重点实验室，宁波 315201）（c叶鹰纺化股份有限公司，绍兴，浙江312030）

关键词：熔喷法;隔膜;锂离子电池;热阻隔性能

出版年,卷(期):页码： 2015,35(6):33-39

摘要：

以聚丙烯树脂为原料,通过熔喷法制备了一种新型的锂离子电池隔膜,以商业锂离子电池聚丙烯隔膜为对比,研究了两种隔膜在电解液吸附速率、润湿性、机械强度以及大倍率充放电条件下的循环稳定性。研究结果显示，由于相互交错的纤维结构，熔喷法制备的锂离子电池隔膜展现出更优异的液体电解液吸附速率、润湿性以及更高的机械强度。此外，在大倍率条件下进行充放电循环,熔喷法制备的隔膜具有更高的比容量与更加优异的循环稳定性。同时,对两种隔膜的热阻隔性能测试也表明，由熔喷法制备的聚丙烯隔膜显示出比商业锂离子电池聚丙烯隔膜更优异的热阻隔性能，可以进一步提高锂离子电池使用的安全性.

Novel polypropylene based separators for lithium ion battery (LIB) was successfully prepared via melt-brown method. Compared with commercial polypropylene based separators, melt-blown separator exhibited both higher mechanical strength and improved absorption rate and wet ability for electrolyte, relating to its inter-connected inside continuous micro-fibrous structures. Due to its excellent properties, the capacity and cycling stability of LIBs assembled with novel melt-brown separator were greatly improved at higher charging or discharging rates. The thermal property measurement for the separator from melt-brown method also showed superior thermal barrier property, which may enhance the safety of lithium ion battery.

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