一种醋酸纤维素交联膜的制备及应用  

Preparation and Application of a Cellulose Acetate Cross-linked Separator

作　　者：姜波 张明祖 何金林 倪沛红 Bo Jiang;Mingzu Zhang;Jinlin He;Peihong Ni(College of Chemistry,Chemical Engineering and Materials Science,Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application,Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis,Soochow University,Suzhou 215123,China)

机构地区：[1]苏州大学材料与化学化工学部江苏省先进功能高分子材料设计及应用重点实验室苏州市大分子设计与精密合成重点实验室,江苏苏州215123

出　　处：《高分子材料科学与工程》2022年第8期139-146,共8页Polymer Materials Science & Engineering

基　　金：苏州大学-滑铁卢大学纳米联合项目。

摘　　要：隔膜是锂离子电池的重要组成部分,制备高性能的隔膜是提升电池性能的重要途径之一。文中通过化学交联方法制备了可用于锂离子电池的纤维素隔膜,即醋酸纤维素(CA)与交联剂六亚甲基二异氰酸酯(HDI)经缩合反应形成交联结构的纤维素基膜。结果表明,与商用聚乙烯隔膜相比,该膜拥有优异的热稳定性、力学强度和电化学性能,在200℃加热30 min几乎不发生热收缩,拉伸强度可达30.70 MPa,其组装的锂离子电池也拥有良好的循环充放电性能,在0.5 C/0.5 C的充放电条件下循环100圈后电池放电比容量可保持95%。The separator is an important part of lithium-ion batteries,and obtaining high-performance separators is a significant way to improve the battery performance.In this paper,the cellulose separator which can be used in lithium-ion batteries was prepared by chemical cross-linking.A cellulose-based cross-linked structure membrane was synthesized with cellulose acetate(CA)and cross-linking agent hexamethylene diisocyanate(HDI)by condensation reaction.The experimental results show that compared with the commercial polyethylene separator,this membrane has the excellent thermal stability,mechanical strength and electrochemical performance,which hardly shrinks at 200℃for 30 min.The tensile strength could reach 30.70 MPa.The assembled lithium-ion battery also has good cycle charge and discharge performance,and the specific discharge capacity of the battery maintains at 95%after 100 cycles under the charge and discharge conditions of 0.5 C/0.5 C.

关 键 词：锂离子电池 隔膜 醋酸纤维素 交联结构 

分 类 号：TM912[电气工程—电力电子与电力传动]