Rational Design of Carbon Covered V₂O_{3- x} Decorated Amorphous MoO₂ Double-Core-Shell Structure Facilitates Ultra-High Stability and High-Rate Performance in Lithium-ion Batteries.

Authors

Gaoyuan Liu, Wei Jia, Xinxin Yin, Biao Yang, Jing Xie, Jindou Hu, Zhenjiang Lu, Yali Cao

Published in

Small (Weinheim an der Bergstrasse, Germany). Pages e2500441. Apr 24, 2025. Epub Apr 24, 2025.

Abstract

Amorphous materials, which bear unique atomic arrangements, have garnered significant study on lithium-ion batteries due to inherent properties, including isotropy and defect distribution. Herein, a novel amorphous MoO_{2- x}@V₂O_{3- x}@C double-core-shell structure is ingeniously designed by simple solvothermal and pyrolytic reactions, and the valence states of amorphous MoO₂ and V₂O₃ are precisely characterized using X-ray absorption near-edge structure spectroscopic measurements. In situ XRD, in situ EIS and density functional theory calculations confirm that the amorphous structure enhances the electronic conductivity of MoO_{2- x}@V₂O_{3- x}@C-2, optimizes the Li⁺ relocation paths and the associated energy barriers, thus improving the Li⁺ diffusion kinetics. Furthermore, the formation of V₂O_{3- x} layer, along with the establishment of a 3D network structure of amorphous carbon, enhanced the electronic conductivity and mitigated swelling of the electrodes, thereby improving stability during battery cycling. Benefiting from this multiscale coordinated design, the optimized MoO_{2- x}@V₂O_{3- x}@C electrodes exhibit high discharge capacity of 477.5 mAh g^-1 at 10.0 A g^-1, along with exceptional cycling stability, showing minimal capacity loss even after undergoing 1000 cycles at 20.0 A g^-1. Additionally, MoO_{2- x}@V₂O_{3- x}@C||LiCoO₂ full batteries maintain good capacity over 300 cycles. The proposed amorphous and core-shell structure fabrication concept offers novel insights into developing advanced high-efficiency energy storage materials.

PMID:
40270324
Bibliographic data and abstract were imported from PubMed on 24 Apr 2025.

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