A High‐Capacity O2‐Type Li‐Rich Cathode Material with a Single‐Layer Li2MnO3 Superstructure
- 13 March 2018
- journal article
- research article
- Published by Wiley in Advanced Materials
- Vol. 30 (16) , e1707255
Abstract
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: ≈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.Keywords
Funding Information
- National Natural Science Foundation of China (U1764255)
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