Issue 16, 2025

Improved anionic redox reversibility of layered oxides by modulating transition metal–oxygen bonds for sodium ion batteries

Abstract

Activating oxygen anionic redox within transition-metal layered oxides as cathode materials is a promising strategy to surpass the capacity constraints typically associated with conventional cationic redox processes in sodium-ion batteries. However, irreversible depletion of lattice oxygen during the charge process usually causes structural instability, resulting in the poor cycling capacity of layered oxides. Herein, a facile magnesium incorporation strategy for Na0.72Li0.24Mn0.76O2 (NLMO) cathode material was used to stabilize the structure by reducing the overall transition metal–oxygen (TM–O) bond lengths and expanding the sodium layer spacing. Theoretical calculations and electron paramagnetic resonance (EPR) results further confirm that the magnesium incorporation is beneficial for improving the overlap between Mn 3d and O 2p orbitals, thereby enhancing the stability of lattice oxygen. Modulating TM–O bonding covalency is crucial in enhancing the structure stability and electrochemical performance of layered oxide cathode materials for sodium-ion batteries.

Graphical abstract: Improved anionic redox reversibility of layered oxides by modulating transition metal–oxygen bonds for sodium ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
11 Jan 2025
Accepted
12 Mar 2025
First published
13 Mar 2025

J. Mater. Chem. A, 2025,13, 11684-11693

Improved anionic redox reversibility of layered oxides by modulating transition metal–oxygen bonds for sodium ion batteries

J. Yan, Y. Wang, Q. Zhou, X. Chen, H. Yang, X. Wang, J. Li, X. Xu, Z. Yuan and P. Zuo, J. Mater. Chem. A, 2025, 13, 11684 DOI: 10.1039/D5TA00231A

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