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<p>Si/TiSi<sub>2</sub> composite material is a promising anode material for lithium-ion batteries. The photovoltaic (PV) silicon waste generated from the PV industry and the Ti-bearing blast furnace slag (TBBFS) generated from the steel industry urgently need to be explored for green and high-value utilization. We proposed a new green method for preparing Si/TiSi<sub>2</sub> anode materials by coupling the utilization of PV silicon waste and TBBFS through induction melting-directional solidification technology, and the feasibility has been confirmed in our previous studies. This paper focuses on the mechanism of the reaction process for preparing Si/TiSi<sub>2</sub> by induction melting-directional solidification. Firstly, thermodynamic calculations were carried out using FactSage 7.2 software. Based on these calculations, experimental studies were conducted to investigate the effects of directional solidification rate, reaction temperature, and reaction time on the composition of reaction products and the distribution of elements. The mechanism of the Si/TiSi<sub>2</sub> formation process was analyzed based on the migration behavior of various elements under different reaction temperatures and times. The results can provide guidance for the development of low-cost, high-performance silicon-based anode materials for lithium-ion batteries and the green, high-value utilization of TBBFS and PV silicon waste.</p>

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Study on the Reaction Process of Si/TiSi2 Composite Prepared by Induction Melting-Directional Solidification Method

  • 期刊论文

  • 发表日期：

    2025年1月14日

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  • Yuan Zhang,
  • Yuchao Zhang,
  • Hongquan Liu,
  • Yanjun Zhong,
  • Ye Wang,
  • Zhiyuan Chen,
  • Xinlong Wang

摘要

Si/TiSi2 composite material is a promising anode material for lithium-ion batteries. The photovoltaic (PV) silicon waste generated from the PV industry and the Ti-bearing blast furnace slag (TBBFS) generated from the steel industry urgently need to be explored for green and high-value utilization. We proposed a new green method for preparing Si/TiSi2 anode materials by coupling the utilization of PV silicon waste and TBBFS through induction melting-directional solidification technology, and the feasibility has been confirmed in our previous studies. This paper focuses on the mechanism of the reaction process for preparing Si/TiSi2 by induction melting-directional solidification. Firstly, thermodynamic calculations were carried out using FactSage 7.2 software. Based on these calculations, experimental studies were conducted to investigate the effects of directional solidification rate, reaction temperature, and reaction time on the composition of reaction products and the distribution of elements. The mechanism of the Si/TiSi2 formation process was analyzed based on the migration behavior of various elements under different reaction temperatures and times. The results can provide guidance for the development of low-cost, high-performance silicon-based anode materials for lithium-ion batteries and the green, high-value utilization of TBBFS and PV silicon waste.