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<p>Silicon suboxide (SiO<sub>x</sub>) is a promising anode material for application in lithium-ion batteries (LIBs). However, the poor initial Coulombic efficiency (ICE) limits its full application potential as a high-capacity anode material. Herein, we demonstrate a scalable approach for improving the ICE of SiO<sub>x</sub> while achieving high capacity. By reducing the oxygen content in silicon monoxide (SiO), controlling the crystallization of SiO<sub>2</sub> in SiO<sub>x</sub>, and combining with carbon coating, the prepared SiO<sub>x</sub>–Li6@C anode displays a high specific capacity of 2170.44 mAh g<sup>−1</sup> and an ICE up to 90.32%. In addition, the lithium-ion full cell was assembled to evaluate its commercial practical potential using SiO<sub>x</sub>–Li6@C as the anode with LiNi<sub>0.8</sub>Co<sub>0.1</sub>Mn<sub>0.1</sub>O<sub>2</sub> (NCM811) as the cathode. After 100 cycles, the NMC811//SiO<sub>x</sub>–Li6@C full cell exhibits a relatively good specific capacity of 73.58 mAh g<sup>−1</sup>, corresponding to a capacity retention of 52.37%. This study offers a feasible and scalable strategy for preparing high-capacity and high ICE SiO<sub>x</sub> anodes.</p>

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Preparation of SiOx anode with improved performance through reducing oxygen content, controlling SiO2 crystallization, and carbon-coating

  • 期刊论文

  • 发表日期：

    2025年1月25日

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  • Dengyuan Wan,
  • Lili Yang,
  • Dan Lv,
  • Runfeng Song,
  • Jie Liu,
  • Wenbin Hu,
  • Cheng Zhong

摘要

Silicon suboxide (SiOx) is a promising anode material for application in lithium-ion batteries (LIBs). However, the poor initial Coulombic efficiency (ICE) limits its full application potential as a high-capacity anode material. Herein, we demonstrate a scalable approach for improving the ICE of SiOx while achieving high capacity. By reducing the oxygen content in silicon monoxide (SiO), controlling the crystallization of SiO2 in SiOx, and combining with carbon coating, the prepared SiOx–Li6@C anode displays a high specific capacity of 2170.44 mAh g−1 and an ICE up to 90.32%. In addition, the lithium-ion full cell was assembled to evaluate its commercial practical potential using SiOx–Li6@C as the anode with LiNi0.8Co0.1Mn0.1O2 (NCM811) as the cathode. After 100 cycles, the NMC811//SiOx–Li6@C full cell exhibits a relatively good specific capacity of 73.58 mAh g−1, corresponding to a capacity retention of 52.37%. This study offers a feasible and scalable strategy for preparing high-capacity and high ICE SiOx anodes.