正硅酸乙酯
阴极
材料科学
原硅酸盐
溶解
涂层
硅酸盐
锂(药物)
碱金属
化学工程
电极
无机化学
矿物学
复合材料
纳米技术
化学
物理化学
有机化学
内分泌学
工程类
医学
作者
Xin Deng,Kang Wu,Rongbin Dang,Na Li,Hong Zhang,Jiwei Jiao,Yu Lin Lee,Zhongbo Hu,Xiaoling Xiao
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2021-05-01
卷期号:168 (5): 050539-050539
被引量:2
标识
DOI:10.1149/1945-7111/abf4ed
摘要
Ni-rich materials are among the most promising cathode materials for use in the electric vehicle industry with high energy density, excellent low temperature performance and rate performance. However, with the increase of Ni content, many problems emerge in Ni-rich materials, such as residual alkali and the side reactions at the electrode surface. In this work, we find that part of the residual lithium at the surface of the Li[Ni 0.8 Co 0.1 Mn 0.1 ]O 2 material can be converted into lithium silicate as a lithium-ion conductor, through the surface treatment of tetraethyl orthosilicate, thereby solving the above problems. Specifically, at a rate of 3C, the material with a coating amount of 2 wt% showed a capacity retention rate of 83.33% after 300 cycles, with the pristine material at only 64.60%. Furthermore, under the protection of the coating layer, the dissolution of the transition metal and side reactions on the cathode electrode surface were effectively suppressed. Experimental results proved that this method is reliable and easy to implement and can serve as a comprehensive solution for common problems of Ni-rich materials.
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