Tuning the stable interlayer structure of SiOx-based anode materials for high-performance lithium-ion batteries

Junhui Zou, Ying Huang, Yangyang Xie, Xianping Du, Chen Chen, Jianghong Zhou, Zhao Bi, Xiaodie Xuan, Yuchen Guo, Yi Tang, Aibo Zhang, Chenhui Yang

科研成果: 期刊稿件文章同行评审

摘要

The significant volume expansion effect and unstable solid electrolyte interphase (SEI) film of SiOx-based anode materials hinder their commercial development. Research has indicated that composite coating is a common strategy to address these crucial issues. This paper reports the preparation of SiOx@TiO2@C nanospheres with a unique interlayer structure using a sol–gel method combined with etching. In the preparation process, SiOx nanospheres serve as the core, and the morphology and electrochemical performance of SiOx@TiO2@C are influenced by NaOH etching for different durations. With increasing etching time, SiOx@TiO2@C nanospheres with a suitable interlayer structure and sufficient gaps were obtained. This distinctive interlayer structure can mitigate the volume expansion of SiOx, enhance the structural stability of the electrode material during repeated Li+ insertion/deinsertion processes, and improve cycling stability. When used as an anode material for lithium-ion batteries, the SiOx@TiO2@C with the best clearance exhibits a reversible capacity of 310.0 mAh g-1 (600 cycles at 2.0 A g-1), a high initial Coulombic efficiency (87%), and excellent cycling performance. This work paves the way for the development of SiOx-based anode materials for high-performance lithium-ion batteries.

源语言英语
文章编号142172
页(从-至)8449-8463
页数15
期刊Journal of Materials Science
60
20
DOI
出版状态已出版 - 5月 2025

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