4.7 Article

Reversible anionic redox and spinel-layered coherent structure enable high-capacity and long-term cycling of Li-rich cathode

Journal

CHEMICAL ENGINEERING JOURNAL
Volume 452, Issue -, Pages -

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.139041

Keywords

Lithium -rich cathode materials; Spinel -layered coherent structure; Reversible anionic redox; Cyclic stability; Lithium -ion battery

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This paper proposes a strategy to improve the reversibility and structural stability of Li-rich cathode materials by introducing a spinel-layered coherent structure and S-anions. Experimental results confirm that the strategy enhances the reversible discharge capacity and initial Coulombic efficiency. The optimized material exhibits high reversible discharge capacity and good cyclic performance.
Initiating effective strategies to improve the reversibility of anionic redox and structural stabilization is crucial to the development and industrial application of Li-rich cathode materials (LRO), which are regarded as the preferred option of the cathode materials for the next-generation lithium-ion battery with high energy density. To remit the unexpected behavior of structural destruction and capacity attenuation, this paper proposes a strategy for maintaining high specific capacity and improving the reversible anionic redox and stable cyclic performance of LRO by introducing the spinel-layered coherent structure and S-anions. Proved by the ex-situ X-ray photoelectron spectroscopy, S-anions can regulate the anionic redox reversibility and thus enhance the reversible discharge capacity and initial Coulombic efficiency. Moreover, the structural stability is greatly improved by the introduction of spinel-layered coherent structure and S-anions in LRO, which has been confirmed by abundant structural characterizations. Besides, the results reveal that the optimized material ex-hibits a high reversible discharge capacity of 289.52 mAh/g and good cyclic performance with a retention rate of 88.21% after 200 cycles. Evidently, the structure design strategy for LRO based on the reversible anionic redox and spinel-layered coherent structure is a significant exploration, which will bring a new clew for the design of the cathode materials with high-energy-density and excellent electrochemical performance.

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