材料科学
扫描电子显微镜
非阻塞I/O
锂(药物)
电解质
溶剂
电化学
化学工程
透射电子显微镜
表面改性
相(物质)
扩散
作者
Jianbo Tang,Qian Xie,Zhishan Chen,Ye Tian,Jianliang Zuo,Liu Zhiting,Wenzhi Zheng
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2022-02-17
标识
DOI:10.1149/1945-7111/ac5655
摘要
Abstract In this study, a suitable surface treatment was designed to optimize the cyclic quality of the LiNi0.8Co0.1Mn0.1O2. Results show that solvent treatment can wash away the lithium compounds on material’s surface, which will hinder the diffusion of Li+ and catalyze the decomposition of the electrolyte. Disorder degree of nickel and oxygen layers will reduce after solvent treatment, which helps Li+ to embed and release better. A protective layer was found on the Solvent-treated surface of NCM811 by scanning electron microscope. Transmission electron microscopy shows that a 3-4nm thick Rock-salt phase NiO generated on the material surface can protect the structure stability and prevent the collapse of material with the process of charge and discharge. Through electrochemical tests show that the electrochemical performance of the material is markedly improved. Therefore, solvent treatment as a convenient modification method has specific industrial application value.
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