Issue 34, 2022

Li trapping in nanolayers of cation ‘disordered’ rock salt cathodes


Disordered rock salt (DRS) cathodes have attracted considerable attention because of their high first charge capacities and relatively low cost. Here we investigate operando the structure and charge evolution of the Li1.1Mn0.7Ti0.2O2 Li-excess rock salt cathode with a first charge capacity of 270 mA h g−1. We associate a certain extent of the capacity fade in DRS to the in situ formation of locally ordered layered nanodomains during the electrochemical cycling of the long-range cation disordered rock salt. We quantify the short-range ordering of cations during cycling and evaluate its effect on the lithium-ion diffusion and charge compensation using operando studies based on X-ray total scattering and advanced spectroscopic methods at the Mn K-edge, namely high energy resolution fluorescence detected XANES and emission spectroscopies including main and valence-to-core transitions.

Graphical abstract: Li trapping in nanolayers of cation ‘disordered’ rock salt cathodes

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Article information

Article type
27 May 2022
22 Jul 2022
First published
22 Aug 2022
This article is Open Access
Creative Commons BY license

J. Mater. Chem. A, 2022,10, 17415-17423

Li trapping in nanolayers of cation ‘disordered’ rock salt cathodes

M. Diaz-Lopez, P. A. Chater, O. Proux, Y. Joly, J. Hazemann, P. Bordet and V. Pralong, J. Mater. Chem. A, 2022, 10, 17415 DOI: 10.1039/D2TA04262B

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