材料科学
阴极
涂层
电化学
介电谱
原子层沉积
无定形固体
电极
化学工程
锂(药物)
氧化物
溶解
纳米技术
图层(电子)
冶金
化学
医学
有机化学
内分泌学
物理化学
工程类
作者
Jizhou Kong,Chong Ren,Guòan Tai,Xiang Zhang,Aidong Li,Di Wu,Hui Li,Fei Zhou
标识
DOI:10.1016/j.jpowsour.2014.05.027
摘要
To enhance the electrochemical performance of LiNi0.5Co0.2Mn0.3O2 cathode, especially at elevated temperature, atomic layer deposition (ALD) technology has facilely used to deposit an ultrathin amorphous ZnO coating onto LiNi0.5Co0.2Mn0.3O2 with precise thickness-control at atomic scale. The coated cathode material with 8 ALD cycles exhibits the significantly improved discharge capacity and cycleability, as compared with those of the bare one. Such enhanced electrochemical performance of the coated sample is ascribed to its high-quality ultrathin amorphous ALD oxide coating, which can protect the active material from HF attack, reduce the dissolution of metal ions in the electrode and favor the lithium diffusion of the oxide proved by the electrochemical impedance spectroscopy (EIS) tests. The simple ALD process provides a potential new approach for the battery industry to fabricate novel electrodes with high performances even cycled at high rate at elevated temperature.
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