钴
镍
锂(药物)
材料科学
图层(电子)
阴极
离子
冶金
化学
复合材料
电气工程
工程类
心理学
精神科
有机化学
作者
Mingyuan Ma,Haijin Ji,Lin Du,Yaqi Liao,Yunhui Huang
标识
DOI:10.1021/acsaem.4c03164
摘要
The layered oxide is considered a promising high-voltage cathode for its high specific capacity. However, its inherent structural instability and capacity decay limit commercial applications. Here, we propose a W–Al–B (WAB) coating layer on the surface of a LiNi0.65Co0.07Mn0.28O2 (NCM) cathode to improve structural stability and reduce side reactions. The WAB protective layer can accelerate lithium-ion (Li+) diffusion at the interface and suppress side reactions between the cathode and the electrolyte at high voltages. After introducing the WAB layer, the reversible discharge capacity of the NCM cathode is increased from 186 to 192 mAh/g at 0.1 C. The WAB@NCM cathode shows better cyclic stability with a capacity retention of 95.2% at 1 C after 150 cycles, in comparison to 91.9% for the bare NCM cathode. According to systematic characterizations, the improved electrochemical performance is ascribed to the formation of LiAlO2, LiWO3, and Li2B4O7 species at the interface. Our functional coating layer design can provide some understanding of long-cycle and high-voltage cathode materials.
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