涂层
镍
阴极
锂(药物)
材料科学
离子
烧结
化学工程
氧化物
容量损失
杂质
冶金
阳极
氧化镍
纳米技术
化学
电极
物理化学
内分泌学
有机化学
工程类
医学
作者
Fengxia Xin,Hui Zhou,Yanxu Zong,Mateusz Zuba,Yan Chen,Natasha A. Chernova,Jianming Bai,Ben Pei,Anshika Goel,Jatinkumar Rana,Feng Wang,Ke An,Louis F. J. Piper,Guangwen Zhou,M. Stanley Whittingham
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2021-03-18
卷期号:: 1377-1382
被引量:141
标识
DOI:10.1021/acsenergylett.1c00190
摘要
Nickel-rich layered metal oxide LiNi1–y–zMnyCozO2 (1 – y – z ≥ 0.8) materials are the most promising cathodes for next-generation lithium-ion batteries in electric vehicles. However, they lose more than 10% of their capacity on the first cycle, and interfacial/structural instability causes capacity fading. Coating and substitution are possible direct and effective solutions to solve these challenges. In this Letter, Nb coating and Nb substitution on LiNi0.8Mn0.1Co0.1O2 (NMC811) is easily produced through a scalable wet chemistry method followed by sintering from 400 to 800 °C. A Li-free Nb oxide treatment is found to remove surface impurities forming a LiNbO3/Li3NbO4 surface coating, to reduce the first capacity loss and to improve the rate performance. Nb substitution stabilizes the structure, as evidenced by less heat evolution on heating, thus providing better long cycling stability with a 93.2% capacity retention after 250 cycles.
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