功能化蒙脱土涂覆改性锂电池用聚丙烯微孔膜的性能  

Performance of Functionalized Montmorillonite Coating Modified Polypropylene Microporous Membrane for Lithium Batteries

作　　者：吴梦玉 张洪文 丁永红 蒋姗 Mengyu Wu;Hongwen Zhang;Yonghong Ding;Shan Jiang(School of Materials Science and Engineering,National Experimental Teaching Demonstration Center,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学材料科学与工程学院常州大学材料科学与工程国家级实验教学示范中心,江苏常州213164

出　　处：《高分子材料科学与工程》2022年第6期132-139,共8页Polymer Materials Science & Engineering

摘　　要：通过聚甲基丙烯酸甲酯(PMMA)插层改性蒙脱土(MMT)获得了功能化改性蒙脱土(MMT-PMMA),通过刮涂在聚丙烯(PP)微孔膜表面引入MMT-PMMA后,再通过浸涂在微孔膜表面引入单宁酸(TA),制备了具有高电解液润湿性和高耐热性的改性微孔膜(PP/MMT-PMMA/TA)。接触角测试结果显示,PP微孔膜改性后,电解液接触角由47°降至0°,且电解液吸收率由PP膜的97.5%提高至136.6%,证明PP/MMT-PMMA/TA微孔膜具有良好的电解液亲和性。将微孔膜在不同温度放置30 min测试其耐热性,结果表明,PP/MMT-PMMA/TA微孔膜的耐热性较改性前的PP微孔膜有显著提升。电池性能测试结果表明,经PP/MMT-PMMA/TA微孔膜组装的电池首次充放电容量(60.0 m Ah/g)相比改性前的PP微孔膜(41.3 mAh/g)提升了45%,且倍率性能更好。Functional modified montmorillonite(MMT-PMMA)was obtained through polymethyl methacrylate(PMMA)intercalation modified montmorillonite(MMT).After the MMT-PMMA preparation slurry was coated on the PP microporous membrane,then the PP microporous membrane was immersed in a tannic acid(TA)solution to obtain a modified microporous membrane(PP/MMT-PMMA/TA)with high electrolyte wettability and high heat resistance.The contact angle test result shows that after modification of the PP microporous membrane,the electrolyte contact angle decreases from 47°to 0°,and the electrolyte absorption rate increases from 97.5% of the PP membrane to 136.6%,proving that the PP/MMT-PMMA/TA microporous membrane has a good electrolyte affinity.The heat resistance of the microporous membrane was tested at different temperatures for 30 min.The results show that the heat resistance of the PP/MMT-PMMA/TA microporous membrane is significantly improved compared to the PP microporous membrane before modification.The battery performance test results show that the first charge and discharge capacity(60.0 mAh/g)of the battery assembled by the PP/MMT-PMMA/TA microporous membrane is 45% higher than that of the PP microporous membrane(41.3 mAh/g)before modification.And the rate performance is better.

关 键 词：蒙脱土 微孔膜 锂离子电池 亲电解液性 

分 类 号：TM912[电气工程—电力电子与电力传动]