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.
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)
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2022年第6期132-139,共8页
Polymer Materials Science & Engineering
关键词
蒙脱土
微孔膜
锂离子电池
亲电解液性
montmorillonite
microporous membrane
lithium-ion battery
electrolyte wettability performance
