Issue 5, 2020

Universal solid-state oxygen redox in antifluorite lithium oxides via transition metal doping

Abstract

Solid-state oxygen redox can potentially be used in high-capacity cathode materials of lithium-ion batteries. This study demonstrates a reversible solid-state oxygen redox in antifluorite lithium oxide via doping of Ni. Ni-Doping of Li2O enables the reversible redox reaction of O2−/O22− in addition to the transition metal redox, with a reversible capacity of 270 mA h g−1. The O K-edge X-ray absorption spectroscopy reveals that the solid-state oxygen redox reaction is universal in transition metal dopants, which are probably activated by the 2p electron holes in O that are formed via hybridization with d orbitals of the transition metal. Considering the cathode performances and earth abundance of dopant transition metals, Ni-doping of Li2O effectively leads to the development of high-capacity cathode materials.

Graphical abstract: Universal solid-state oxygen redox in antifluorite lithium oxides via transition metal doping

Supplementary files

Article information

Article type
Paper
Submitted
09 Jun 2020
Accepted
13 Jul 2020
First published
14 Jul 2020
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2020,1, 1301-1306

Universal solid-state oxygen redox in antifluorite lithium oxides via transition metal doping

H. Kobayashi, T. Makimoto, Y. Ogasawara, K. Harada, M. Nakayama, M. Hibino, T. Kudo, N. Mizuno and K. Yamaguchi, Mater. Adv., 2020, 1, 1301 DOI: 10.1039/D0MA00395F

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