衰退
阴极
电化学
X射线光电子能谱
氧化还原
材料科学
电压
离子
浓度梯度
电极
化学工程
分析化学(期刊)
化学
冶金
环境化学
电气工程
物理化学
工程类
频道(广播)
有机化学
作者
Dong Luo,Xiaoxia Ding,Xiaodong Hao,Huixian Xie,Jiaxiang Cui,Peizhi Liu,Xiaohua Yang,Zuhao Zhang,Junjie Guo,Shuhui Sun,Zhan Lin
出处
期刊:ACS energy letters
[American Chemical Society]
日期:2021-07-16
卷期号:6 (8): 2755-2764
被引量:45
标识
DOI:10.1021/acsenergylett.1c01215
摘要
Li-rich layered oxides (LLOs) suffer from severe voltage decay and capacity fading which have hindered their practical application for years. Herein, Co-free LLO microspheres with Ni/Mn and Al dual concentration-gradients are constructed to mitigate the above obstacles. One concentration-gradient is an electrochemical active gradient (Ni/Mn), and the other is an electrochemical inert gradient (Al). XPS and soft and hard XAS after different cycles prove that the combination of dual concentration-gradients effectively mitigates interfacial reactions, structural evolution, and the generation of lower-valence Mn3+/Mn4+ or Mn2+/Mn3+ redox couples during cycling. As a result, the voltage fading rate of LLO cathode with dual concentration-gradients after 100 cycles is as small as 0.97 mV/cycle at 100 mA g–1. Furthermore, its capacity retention ratio is also as large as 84.1% after 400 cycles at 300 mA g–1. The combination of dual concentration-gradients in this work provides a way to develop advanced LLO cathodes for practical application in the near future.
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