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<p>The significant volume expansion effect and unstable solid electrolyte interphase (SEI) film of SiO<sub><i>x</i></sub>-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 SiO<sub><i>x</i></sub>@TiO<sub>2</sub>@C nanospheres with a unique interlayer structure using a sol–gel method combined with etching. In the preparation process, SiO<sub><i>x</i></sub> nanospheres serve as the core, and the morphology and electrochemical performance of SiO<sub><i>x</i></sub>@TiO<sub>2</sub>@C are influenced by NaOH etching for different durations. With increasing etching time, SiO<sub><i>x</i></sub>@TiO<sub>2</sub>@C nanospheres with a suitable interlayer structure and sufficient gaps were obtained. This distinctive interlayer structure can mitigate the volume expansion of SiO<sub><i>x</i></sub>, enhance the structural stability of the electrode material during repeated Li<sup>+</sup> insertion/deinsertion processes, and improve cycling stability. When used as an anode material for lithium-ion batteries, the SiO<sub><i>x</i></sub>@TiO<sub>2</sub>@C with the best clearance exhibits a reversible capacity of 310.0 mAh g<sup>-1</sup> (600 cycles at 2.0 A g<sup>-1</sup>), a high initial Coulombic efficiency (87%), and excellent cycling performance. This work paves the way for the development of SiO<sub><i>x</i></sub>-based anode materials for high-performance lithium-ion batteries.</p>

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

  • 期刊论文

  • 发表日期：

    2025年5月21日

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

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.