插层(化学)
氧化物
离子
阴极
化学物理
相变
过渡金属
无机化学
材料科学
化学工程
化学
纳米技术
热力学
物理化学
有机化学
冶金
物理
工程类
生物化学
催化作用
作者
Chenglong Zhao,Feixiang Ding,Yaxiang Lu,Liquan Chen,Yong-Sheng Hu
标识
DOI:10.1002/ange.201912171
摘要
Material innovation on high-performance Na-ion cathodes and the corresponding understanding of structural chemistry still remain a challenge. Herein, we report a new concept of high-entropy strategy to design layered oxide cathodes for Na-ion batteries. An example of layered O3-type NaNi0.12Cu0.12Mg0.12Fe0.15Co0.15Mn0.1Ti0.1Sn0.1Sb0.04O2 has been demonstrated, which exhibits the longer cycling stability (ca. 83 % of capacity retention after 500 cycles) and the outstanding rate capability (ca. 80 % of capacity retention at the rate of 5.0 C). A highly reversible phase-transition behavior between O3 and P3 structures occurs during the charge-discharge process, and importantly, this behavior is delayed with more than 60 % of the total capacity being stored in O3-type region. Possible mechanism can be attributed to the multiple transition-metal components in this high-entropy material which can accommodate the changes of local interactions during Na+ (de)intercalation. This strategy opens new insights into the development of advanced cathode materials.
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