本研究通过聚甲基丙烯酸甲酯(PMMA)插层改性蒙脱土(MMT)获得功能化改性蒙脱土(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下放置30 min测试耐热性,结果表明PP/MMT-PMMA/TA微孔膜的耐热性较改性前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 mAh/g)相比改性前PP微孔膜(41.3 mAh/g)提升了45%,且倍率性能也更好。
In this study, functional modified montmorillonite (MMT-PMMA) was obtained through polymethyl methacrylate (PMMA) intercalation modified montmorillonite (MMT). After MMT-PMMA preparation slurry was coated on the PP microporous membrane, Then immersed the PP microporous membrane 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: After modification of the PP microporous membrane, the electrolyte contact angle decreased from 47° to 0°, and the electrolyte absorption rate increased 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.