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Research Article | Open Access

V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency

Liping Tan1, Wenzhao Huang1, Xiaoyan Xie1, Xiaola Li1, Ziyang Liang1, Zhan Lin1,3, Chenyu Liu1,3( ), Dong Luo1,2( )
School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China
School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China
Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory (Rongjiang Laboratory), Jieyang 515200, China
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Abstract

Li-rich Mn-based oxides (LRMOs) hold great promise as next-generation cathode materials for high-energy Li-ion batteries because of their low cost and high capacity. Nevertheless, the practical application of LRMOs is impeded by their low initial Coulombic efficiency and rapid voltage decay. Herein, a V-doped layered-spinel coherent layer is constructed on the surface of a Co-free LRMO through a simple treatment with NH4VO3. The layered-spinel coherent layer with 3D ion channels enhanced Li+ diffusion efficiency, mitigates surface–interface reactions and suppresses irreversible oxygen release. Notably, V-doping significantly reduces the Bader charge of oxygen atoms, thereby impeding excessive oxidation of oxygen ions and further enhancing the stability of O-redox. The modified LRMO exhibites a remarkable initial Coulombic efficiency of 91.6%, significantly surpassing that of the original LRMO (74.4%). Furthermore, the treated sample showes an impressive capacity retention rate of 91.9% after 200 cycles, accompanied by a voltage decay of merely 0.47 mV per cycle. The proposed treatment approach is straightforward and significantly improves the initial Coulombic efficiency, voltage stability, and capacity stability of LRMO cathode materials, thus holding considerable promise for the development of high-energy Li-ion batteries.

Keywords

voltage stabilityCo-free Li-rich layered oxideV-doped layered-spinel coherent layerhigh initial Coulombic efficiency

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Energy Materials and Devices
Volume 2 Issue 3,
September 2024
Article number: 9370039
DOI: 10.26599/EMD.2024.9370039
Cite this article:
Tan L, Huang W, Xie X, et al. V-doped Co-free Li-rich layered oxide with enhanced oxygen redox reversibility for excellent voltage stability and high initial Coulombic efficiency. Energy Materials and Devices, 2024, 2(3): 9370039. https://doi.org/10.26599/EMD.2024.9370039

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Received: 17 April 2024
Revised: 22 May 2024
Accepted: 26 May 2024
Published: 30 September 2024
© The Author(s) 2024. Published by Tsinghua University Press.

The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
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