聚酰亚胺基锂电隔膜的制备及性能  

Preparation and Performance of Polyimide Separator for Lithium-ion Batteries

作　　者：王岳[1] 王爽[1] 王爱萍 

机构地区：[1]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001 [2]索维尔投资有限公司上海公司,上海201203

出　　处：《塑料工业》2018年第1期138-141,94,共5页China Plastics Industry

摘　　要：以可溶性聚酰亚胺树脂为原料,通过相转化法制备新型锂电隔膜,对其形貌、孔道结构、电解液亲和性、热稳定性和电池性能进行测试。结果显示,该隔膜表面具有均匀的微孔结构,表面孔为1~2μm,内部为发达的海绵状三维孔道结构,隔膜的平均孔径约为420 nm,孔隙率为72%,达到市售聚乙烯隔膜的2倍;该隔膜显示出良好的电解液亲和性,吸液率达到345%,为聚乙烯隔膜的3倍;该隔膜具有优异的耐热性,经过150℃、40 min的热处理后结构未发生明显变化。基于良好的亲和性和耐热性,与聚乙烯隔膜对照,聚酰亚胺基三维孔道隔膜所装配电池发挥出更好的充放电性能。With soluble polyimide resin as raw material, a new type of lithium-ion separator was prepared by phase transformation method, and the investigations on its morphology, pore structure, electrolyte affinity, thermal stability and battery performance were carried out. The results demonstrate that the PI-based separator exhibits well developed three-dimensional porous structures with the average pore diameter of 420 nm and the porosity of 72%, which is twice higher than that of commercially available polyethylene （PE） separator. The PI separator also shows excellent electrolyte uptake of 345%, three times that of PE separator; and the former has good thermal stability because its structure changes a little after treatment at 150 ℃ for 40 min. Compared to the commercial PE separator, the PI separator exhibits better electrochemical performances, such as the discharge C-rate capability and cycling performance.

关 键 词：隔膜 聚酰亚胺 三维孔道 热稳定性 电化学性能 

分 类 号：TQ323.7[化学工程—合成树脂塑料工业]