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A High‐Capacity O2‐Type Li‐Rich Cathode Material with a Single‐Layer Li 2 MnO 3 Superstructure
Author(s) -
Zuo Yuxuan,
Li Biao,
Jiang Ning,
Chu Wangsheng,
Zhang Hao,
Zou Ruqiang,
Xia Dingguo
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707255
Subject(s) - cathode , materials science , superstructure , redox , lithium (medication) , electrode , chemical engineering , layer (electronics) , oxygen , ion , nanotechnology , chemistry , thermodynamics , metallurgy , medicine , physics , organic chemistry , engineering , endocrinology
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 Li 2 MnO 3 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 Li 2 MnO 3 superstructure can deliver an extraordinary reversible capacity of 400 mAh g −1 (energy density: ≈1360 Wh kg −1 ). The activation of a single‐layer Li 2 MnO 3 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.