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<p>Si–C composite anodes have recently attracted considerable attention as high-performance anode materials for lithium-ion batteries. This study was aimed at establishing a facile method for synthesizing Si–C composite anodes, based on co-pyrolysis of petroleum residue oil and Si nanoparticles. The Si content was varied to identify the limits of Si incorporation. Anisotropic carbon with evenly dispersed silicon was successfully produced, and the threshold beyond which silicon aggregation degrades carbon anisotropy was identified. The anisotropic carbon–silicon nanocomposite anode displayed a high specific capacity of 459.1 mAh/g, excellent rate capability at 1000&#xa0;mA/g, and superior cyclability. Excessive addition of silicon nanoparticles led to reduced cyclability and rate capability. Overall, this study provides an effective method for producing Si–C composite anodes with enhanced electrochemical performance.</p>

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Facile co-pyrolysis synthesis of nano si-anisotropic C composite anodes with controlled silicon dispersion for high-performance lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2026年7月4日

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  • Chaehun Lim,
  • Sangyeop Lee,
  • Minah Kang,
  • Seongjae Myeong,
  • Young-Seak Lee

摘要

Si–C composite anodes have recently attracted considerable attention as high-performance anode materials for lithium-ion batteries. This study was aimed at establishing a facile method for synthesizing Si–C composite anodes, based on co-pyrolysis of petroleum residue oil and Si nanoparticles. The Si content was varied to identify the limits of Si incorporation. Anisotropic carbon with evenly dispersed silicon was successfully produced, and the threshold beyond which silicon aggregation degrades carbon anisotropy was identified. The anisotropic carbon–silicon nanocomposite anode displayed a high specific capacity of 459.1 mAh/g, excellent rate capability at 1000 mA/g, and superior cyclability. Excessive addition of silicon nanoparticles led to reduced cyclability and rate capability. Overall, this study provides an effective method for producing Si–C composite anodes with enhanced electrochemical performance.