纤维素/聚丙烯酰胺复合隔膜及其锂金属电池性能  

Cellulose/polyacrylamide composite separator and its performance in lithium metal batteries

作　　者：麻志微 邹淑芬[1] 曾蓉 刘颖[1] 王林[1] 张佳敏 那兵[1] 柳和生[1,2] MA Zhiwei;ZOU Shufen;ZENG Rong;LIU Ying;WANG Lin;ZHANG Jiamin;NA Bing;LIU Hesheng(School of Chemistry and Materials Science,East China University of Technology,Nanchang 330013,China;School of Mechatronics and Vehicle Engineering,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]东华理工大学化学与材料学院,南昌330013 [2]华东交通大学机电与车辆工程学院,南昌330013

出　　处：《功能材料》2025年第3期3150-3157,共8页Journal of Functional Materials

基　　金：江西省重点研发计划项目(20223BBE51025)。

摘　　要：隔膜是锂电池的重要部件之一。商业化聚烯烃隔膜的电解液润湿性差、高温热收缩,难以满足高性能锂电池发展的需要。通过在醋酸纤维素(CA)溶液中原位聚合丙烯酰胺,并采用同步相分离和脱乙酰,制备了纤维素/聚丙烯酰胺(d-CA/PAM)复合隔膜。d-CA/PAM隔膜具有高孔隙率(77.9%)、高电解液吸收率(273.0%)、优异的热稳定性(在200℃下不收缩)和高离子电导率(1.51 mS/cm)。d-CA/PAM隔膜组装的锂金属电池在1 C时表现出比聚烯烃隔膜更高的初始放电比容量(150.1 mAh/g vs.143.0 mAh/g)和更好的容量保持率(100次循环94.3%vs.92.0%)。The separator is a crucial component in lithium batteries.Commercially available polyolefin separators often suffer from poor electrolyte wettability and high-temperature shrinkage,which limits their suitability for the development of high-performance lithium batteries.In this study,a cellulose/polyacrylamide(d-CA/PAM)composite separator was prepared by in situ polymerization of acrylamide in a cellulose acetate(CA)solution,followed by synchronous phase separation and deacetylation.The d-CA/PAM separator exhibits high porosity(77.9%),excellent electrolyte uptake(273.0%),outstanding thermal stability(no shrinkage at 200℃),and a high ionic conductivity(1.51 mS/cm).The lithium metal batteries assembled with the d-CA/PAM separator demonstrate superior performance compared to polyolefin separators,showing a higher initial capacity(150.1 mAh/g vs.143.0 mAh/g)and better cycling stability(capacity retention after 100 cycles 94.3%vs.92.0%).

关 键 词：纤维素 相分离 脱乙酰 复合隔膜 锂金属电池 

分 类 号：TM912[电气工程—电力电子与电力传动]