材料科学
聚丙烯腈
涂层
阴极
化学工程
电解质
电化学
法拉第效率
锂(药物)
复合材料
电导率
聚合物
电极
物理化学
医学
工程类
内分泌学
化学
作者
Di Liang,Jian Wei,Yuxuan Ji,Bing Chen,Xueting Li,Xifei Li
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2022-01-01
卷期号:14 (46): 17331-17344
被引量:11
摘要
LiNi0.8Co0.1Mn0.1O2 (NCM811) has attracted extensive attention due to its high energy density. Particularly, the Li-Ni mixing phenomenon and interfacial side reactions contribute to the rate and cycling performance of NCM811. Cross-linked polyacrylonitrile (cPAN) has certain electrical conductivity and is considered a competitive coating material. In this study, NCM811@cPAN was successfully prepared by wet chemical and heat treatments. The formation process of cPAN systematically analyzed by physical structure tests and microscopic morphological analysis demonstrates that cPAN existed on the surface of NCM811. The electrochemical results demonstrate that NCM811@cPAN has high initial coulombic efficiency (98.14% at 0.1C), good cycle stability and rate performance (222.30 mA h g-1 at 0.5C). The uniform and continuous nano cPAN coating helped avoid direct contact between NCM811 and the electrolyte, enhancing its interfacial stability. Moreover, cPAN exhibited certain electronic conductivity and generated a spinel structure, enhancing the diffusion rate of e- and Li+. Therefore, the electrochemical performance of NCM811 can be improved. This method and the coating material provide an effective strategy for the surface modification of other cathode materials used in Li-ion batteries.
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