A High-Capacity O2-Type Li-Rich Cathode Material with a Single-Layer Li2 MnO3 Superstructure

Yuxuan Zuo; Biao Li; Ning Jiang; Wangsheng Chu; Hao Zhang; Ruqiang Zou; Dingguo Xia

doi:10.1002/adma.201707255

A High-Capacity O2-Type Li-Rich Cathode Material with a Single-Layer Li₂ MnO₃ Superstructure

Adv Mater. 2018 Apr;30(16):e1707255. doi: 10.1002/adma.201707255. Epub 2018 Mar 13.

Authors

Yuxuan Zuo¹, Biao Li¹, Ning Jiang¹, Wangsheng Chu², Hao Zhang¹, Ruqiang Zou¹, Dingguo Xia¹

Affiliations

¹ Beijing Key Laboratory of Theory and Technology for Advanced Batteries Materials, College of Engineering, Peking University, Beijing, 100871, P. R. China.
² National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.

PMID: 29532965
DOI: 10.1002/adma.201707255

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 Li₂ MnO₃ 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 Li₂ MnO₃ superstructure can deliver an extraordinary reversible capacity of 400 mAh g^-1 (energy density: ≈1360 Wh kg^-1 ). The activation of a single-layer Li₂ MnO₃ 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: O2-type Li-rich compounds; reversible capacity; superstructure; voltage fading.