醋酸纤维素/甲基丙烯酸甲酯交联隔膜的制备与性能  

Preparation and Properties of Cellulose Acetate/Methyl Methacrylate Cross-Linked Separator

作　　者：刘远哲 姜波 张明祖 何金林 倪沛红 Yuanzhe Liu;Bo Jiang;Mingzu Zhang;Jinlin He;Peihong Ni(College of Chemistry,Chemical Engineering and Materials Science,State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials,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新型功能高分子材料国家地方联合工程实验室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》2021年第12期121-127,共7页Polymer Materials Science & Engineering

基　　金：江苏省自然科学基金面上项目(BK20151263)。

摘　　要：通过醋酸纤维素与甲基丙烯酰氯之间的酯化反应,成功合成了带双键的醋酸纤维素(M-CA)。以M-CA为基体材料,引入活性单体甲基丙烯酸甲酯(MMA),通过紫外光引发聚合制备了具有交联结构的锂离子电池隔膜。结果表明,该隔膜的耐溶剂性和电解液亲和性均得到明显提升;当MMA中双键量为M-CA中双键量的7倍时,所制备的CM7膜具有较好的综合性能,其吸液率为364%,机械强度为31.91 MPa,离子电导率为2.61 mS/cm;由CM7膜组装的LiFePO_(4)/Li锂离子电池具有良好的倍率放电能力和循环充放电稳定性。The cellulose acetate with double bond(M-CA)was successfully synthesized by esterification reaction between cellulose acetate and methyl acryloyl chloride.A lithium-ion battery separator with cross-linked structure was formed by UV induced polymerization of M-CA with methyl methacrylate(MMA)monomer.The experimental results show that the solvent resistance and electrolyte affinity of the membrane are significantly improved.When the total amount of ethylene groups in MMA is 7 times of that in M-CA,the obtained CM7 membrane has better comprehensive properties,with a liquid absorption rate of 364%,a mechanical strength of 31.91 MPa and an ionic conductivity of 2.61 mS/cm,and the LiFePO_(4)/Li lithium-ion battery assembled by the CM7 membrane also has a good rate discharge capacity and cyclic charge-discharge stability.

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]