Issue 40, 2024

Mg-rich disordered rocksalt oxide cathodes for Mg-ion batteries

Abstract

The discovery of new transition metal (TM) oxide cathodes which can act as intercalation hosts for Mg2+ ions is critical for the development of high energy density Mg-ion batteries. In Li-ion batteries, disordered rocksalts with sufficiently high Li+ charge carrier ion concentration, i.e. Li : TM >1.1, can support fast Li+ diffusion and therefore deliver high capacities (∼300 mA h g−1) and rate performance. Here, we investigate a range of simple Mg-rich disordered rocksalt cathodes, Mg2TMO3 (TM = Mn, Ni, Co), which possess similar charge carrier ion concentrations and similar ratios between the ion size and interstitial tetrahedron height to Li-rich disordered rocksalts. However, even with high carbon loadings, elevated cycling temperatures and reduced particle and crystallite size, no significant Mg2+ deintercalation was observed, indicating that conventional design rules established for Li-rich DRS cannot be simply translated to Mg-rich systems. Despite the lack of activity in Mg-rich oxides, we demonstrate that Mg2+ intercalation into close-packed cubic disordered rocksalts, such as Li2−xMnO2F (x = 1), is possible, opening possible routes to activating Mg-rich systems.

Graphical abstract: Mg-rich disordered rocksalt oxide cathodes for Mg-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
05 apr 2024
Accepted
08 avg 2024
First published
12 avg 2024
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2024,12, 27303-27310

Mg-rich disordered rocksalt oxide cathodes for Mg-ion batteries

Y. Quan, D. Ji, Y. Yuan, H. Xu, R. Qi, S. De Sousa Coutinho, S. Riedel, Z. Zhao-Karger, L. Song, A. W. Robertson, P. G. Bruce and R. A. House, J. Mater. Chem. A, 2024, 12, 27303 DOI: 10.1039/D4TA02348J

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