聚醚醚酮/碳纳米管改性聚丙烯Janus复合隔膜的制备及性能  

Preparation and Properties of Poly(ether ether ketone)/Carbon Nanotube Modified Polypropylene Janus Composite Separator

作　　者：杜新伟 赵文杰[1] 呼微[1,2] 孙昭艳 刘万利[4] 任天磊 付明星 DU Xin-Wei;ZHAO Wen-Jie;HU Wei;SUN Zhao-Yan;LIU Wan-Li;REN Tian-Lei;FU Ming-Xing(School of Chemical Engineering,Changchun University of Technology,Changchun 130012,China;College of Chemistry,Northeast Normal University,Changchun 130024,China;State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;Zhongke Kinhua Changchun High-Tech Company,Changchun 130000,China;China Nuclear Power Engineering Company,Shenzhen 518000,China)

机构地区：[1]长春工业大学化学工程学院,长春130012 [2]东北师范大学化学学院,长春130024 [3]中国科学院长春应用化学研究所,高分子物理与化学国家重点实验室,长春130022 [4]中科英华长春高技术有限公司,长春130000 [5]中广核工程有限公司,深圳518000

出　　处：《应用化学》2022年第12期1862-1869,共8页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金面上项目(No.52073044);国家自然科学基金区域创新发展基金(No.U21A20330);吉林省科技厅重点研发项目(No.20200401036GX);吉林省发改委产业创新专项资金(No.2021C036-2);长春市科技局重点研发计划应用基础研究专项(No.21ZY32);长春新区2019年度“长白慧谷”英才计划高层次创新创业人才项目(No.9-2020004);中国科学院长春应用化学研究所国家高分子物理和化学重点实验室开放课题(Nos.2021-25,2022-19)的资助。

摘　　要：锂离子电池(LIBs)因其在电动汽车领域的广阔前景而受到广泛关注。然而,由于商业化聚烯烃隔膜的热尺寸稳定性差和电解液浸润性低,锂离子电池的安全问题和低倍率性能限制了它们的进一步发展。将高热稳定性和高力学性能的聚醚醚酮(PEEK)/碳纳米管(CNT)涂覆改性聚丙烯(PP)隔膜,得到单面导电的Janus复合隔膜并进行了研究。具体步骤是将CNT与PEEK(质量分数为7%)的硫酸/甲烷磺酸溶液进行溶液复合,制备涂覆液,涂覆在经过臭氧氧化改性的PP隔膜上,再以甲醇/水为凝固浴,在膜表面采用溶液相转化法致孔,得到单面导电的多孔Janus复合PP隔膜(PP@C)。PP@C复合膜在180℃下0.5 h没有出现熔融变形(仅略微形变),表现出优异的尺寸热稳定性;PP@C2复合膜的电解质吸收率为193.8%,较PP膜提高了64.5%,表现出非常好的电解液浸润性。采用PP@C组装的LIBs在0.2 C时的放电比容量为157.6 mA·h/g,2 C时的放电比容量为129.8 mA·h/g,表现出良好的倍率性能,且从高倍率恢复至低倍率放电时,容量恢复率达到99%以上。这是由于涂覆层中PEEK的高热稳定性和对电解液的良好浸润性,以及CNT的高导电率和对锂离子(Li+)的均匀存储和分散,使隔膜能够在提高电池安全性的前提下,同时具有优异的电化学性能。Lithium-ion batteries(LIBs)have attracted wide attention because of their broad prospects in electric vehicles. However,the safety problems and low multiplier performance of the commercial polyolefin separator limit their further development,due to the poor dimensional thermal stability and low electrolyte absorption rate. Poly(ether ether ketone)(PEEK)and carbon nanotube(CNT)are compounded to coat on polypropylene(PP) to prepare Janus composite separator(PP@C) through the phase inversion method.PP@C composite separator does not deform at 180 ℃ for 0. 5 h(only slight deformation),illustrating excellent thermal stability. The electrolyte absorption rate of PP@C2 is 193. 8%. The electrolyte uptake rate of the PP@C2 composite membrane was 193. 8%,which was 64. 5% higher than the PP membrane,showing a superduper electrolyte permeability. As a result,the specific discharge capacity of LIBs assembled with PP@C2 composite separator is 157. 6 mA·h/g at 0. 2 C and 129. 8 mA·h/g at 2 C,showing good rate performance with the capacity recovery rate of more than 99%. This might be attributed to the ultra-high thermal stability of PEEK,the good affinity of the electrolyte,the high conductivity of CNT,as well as the uniform dispersion of Li+,so that the separator can have excellent electrochemical performance while improving safety.

关 键 词：聚醚醚酮 碳纳米管 相转化 尺寸热稳定性 Janus复合隔膜 

分 类 号：O625.4[理学—有机化学]