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中文摘要: 以聚乙烯(PE)隔膜为基底,涂覆聚偏氟乙烯(PVDF)和纳米氧化铝(nano-Al2O3),通过相转化的方法形成多孔陶瓷涂层,以改善聚乙烯隔膜对电解液的润湿能力、吸液能力及其热稳定性和电化学稳定性。结果表明:当涂层溶液中w(PVDF)=0.15,w(nano-Al2O3)=0.3时,改性隔膜的吸液率比纯PE隔膜提高了211.5%,水接触角降低了41.3°,热分解温度和电化学稳定窗口分别提高了73.4 °C和0.2 V。电池的容量保持率达到96.17%,而纯PE隔膜的只有85.78%。改性后隔膜的润湿能力、稳定性、安全性以及循环性能都有较大程度的提高。
Abstract:In order to improve the liquid electrolyte uptake, wetting ability to electrolyte solution, thermal stability and electrochemical stability of the polyethylene(PE) separator membranes, the PE separator membranes were coated with polyvinylene fluoride(PVDF) and nano aluminum oxide (nano-Al2O3) to form porous ceramic coating using phase inversion. Results show that when the mass fraction of PVDF to nano-Al2O3 is 0.15 and 0.3, respectively, in coating solution, the liquid electrolyte uptake increases by 211.5%, water contact angle reduces by 41.3°, thermal decomposition temperature and electrochemical stability window increase by 73.4 °C and 0.2 V respectivedy compared to the unmodified membrane. The capacity retention rate of the modified membrane reaches 96.17%, while that of the unmodified one is only 85.78%, which means that wetting ability, stability, security and cycling performance of the modified membrane is enhanced greatly.
keywords: lithium ion battery ceramic composite separator liquid electrolyte uptake thermal stability electrochemical
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基金项目:河南省重点攻关(092102210100);河南省高校青年骨干教师资助计划
引用本文:
尹艳红,毛新欣,曹朝霞,李向南,丁现亮,杨书廷.相转化法制备陶瓷涂层改性锂离子电池隔膜[J].功能高分子学报,2012,25(2):.
YIN Yan hong,MAO Xin xin,CAO Zhao xia,LI Xiang nan,DING Xian liang,YANG Shu ting.Modification of Lithium Ion Battery Separator with Ceramic CoatingUsing Phase Inversion[J].Journal of Functional Polymers,2012,25(2):.
尹艳红,毛新欣,曹朝霞,李向南,丁现亮,杨书廷.相转化法制备陶瓷涂层改性锂离子电池隔膜[J].功能高分子学报,2012,25(2):.
YIN Yan hong,MAO Xin xin,CAO Zhao xia,LI Xiang nan,DING Xian liang,YANG Shu ting.Modification of Lithium Ion Battery Separator with Ceramic CoatingUsing Phase Inversion[J].Journal of Functional Polymers,2012,25(2):.