退火(玻璃)
材料科学
微观结构
阴极
电化学
无定形固体
涂层
化学工程
兴奋剂
复合材料
化学
结晶学
电极
光电子学
物理化学
工程类
作者
Yunhui Zeng,Xiaoxiao Lü,Qinzhong Mao,Yinfeng Wang,Tongzong Ji,Xiao Fei Guo,RuiHao Shan,Jie Zhou,Yang Xia,Yurong Cai,Juming Yao
标识
DOI:10.1016/j.ces.2023.119167
摘要
Li2ZrO3 (LZO) coating has been routinely applied on Ni-rich NCM cathode materials via two-step processes to improve their electrochemical performances, but procedures for sample preparation remain elusive. Ni-rich NCM materials are particularly sensitive to temperatures, but annealing temperatures show random variation between 400 and 850 °C in literatures. In this work, the influence of annealing temperature on microstructures and electrochemical properties are systematically studied for the LZO-modified NCM811. It is found that, a thicker LZO coating with amorphous features can be obtained at a lower annealing temperature; but the LZO is fully dissolved into the crystal lattice of NCM811 at a higher temperature. The best electrochemical performance is achieved at the condition of 750 °C, because an optimized annealing temperature can introduce moderate Zr4+ doping and obtain high-quality coating layers. This work offers a guidance for industrial to enhance electrochemical performances of Ni-rich NCM cathode materials during surface modification processes.
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