材料科学
阴极
涂层
扫描电子显微镜
X射线光电子能谱
电化学
单晶硅
电解质
锂(药物)
化学工程
介电谱
透射电子显微镜
电极
复合材料
纳米技术
冶金
化学
硅
物理化学
内分泌学
工程类
医学
作者
Luyu Li,Guorong Hu,Yanbing Cao,Zhongdong Peng,Xiang Zhang,Shuai Zhang,Ke Du
标识
DOI:10.1016/j.apsusc.2022.152794
摘要
In this paper, micron-sized monocrystalline LiNi0.65Co0.07Mn0.28O2 cathode material is coated by nano-sized Co(OH)2 to optimize the electrochemical performance and structural stability. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy are applied to characterize the as-prepared samples. The characterizations suggest successful coating and excellent structural stability for LiNi0.65Co0.07Mn0.28O2 with 0.5 wt% Co(OH)2 coating. Electrochemical tests reveal improved rate capability and outstanding capacity retention of 95.3% and 84.2% after 100 cycles at cut-off voltage of 4.3 V and 4.5 V, respectively. The enhanced electrochemical property is attributed to the removal of residual lithium compounds by reacting with cobalt hydroxide, which prevents side reaction between electrode and electrolyte, and mitigates the crack generation and propagation during cycling.
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