期刊
ADVANCED MATERIALS
卷 30, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201707255
关键词
O2-type Li-rich compounds; reversible capacity; superstructure; voltage fading
类别
资金
- High-Performance Computing Platform of Peking University
- New Energy Project for Electric Vehicle of National Key Research and Development Program [2016YFB0100200]
- Nation Natural Science Foundation of China [U1764255]
A high capacity cathode is the key to the realization of high-energy-density lithium-ion batteries. The anionic oxygen redox induced by activation of the Li2MnO3 domain has previously afforded an O3-type layered Li-rich material used as the cathode for lithium-ion batteries with a notably high capacity of 250-300 mAh g(-1). However, its practical application in lithium-ion batteries has been limited due to electrodes made from this material suffering severe voltage fading and capacity decay during cycling. Here, it is shown that an O2-type Li-rich material with a single-layer Li2MnO3 superstructure can deliver an extraordinary reversible capacity of 400 mAh g(-1) (energy density: approximate to 1360 Wh kg(-1)). The activation of a single-layer Li2MnO3 enables stable anionic oxygen redox reactions and leads to a highly reversible charge-discharge cycle. Understanding the high performance will further the development of high-capacity cathode materials that utilize anionic oxygen redox processes.
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