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<p>Herein, we have derived two different mesoporous Si via the oxidation of magnesium silicide synthesized by a high-energy ball milling technique. The as-synthesized Mg<sub>2</sub>Si ball-milled powders was exposed to the air atmosphere, intentionally, for self-combustion. The behaviour porous silicon derived from self-combustion of Mg<sub>2</sub>Si was compared with porous Si derived from the porous Si derived from heat treatment of Mg<sub>2</sub>Si. Electron microscopic investigations indicate the formation of various MgO morphology, and that resulted in samples with different pore sizes and surface areas. By preparing 5 wt% Si/graphite electrodes, the porous silicon derived from self-combustion of Mg<sub>2</sub>Si possesses a capacity of over 450 mAh/g, higher than graphite (350 mAh/g) over 200 cycles. The material with a larger size and pore volume performs better than the one with a smaller pore size and volume. Most interestingly, the production cost of Si-based anodes can be effectively reduced via this simple ball milling technique, thus this porous Si has great potential to be used as an anode additive in Lithium-ion battery applications.</p>

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Effect of self-combustion on electrochemical performance of porous Si derived from ball milled Mg2Si: a composite electrode for lithium-ion batteries

  • 期刊论文

  • 发表日期：

    2025年1月30日

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  • Elamathy Balamoorthy,
  • Prashanth Sivakumar,
  • Thirugnasambandam G. Manivasagam

摘要

Herein, we have derived two different mesoporous Si via the oxidation of magnesium silicide synthesized by a high-energy ball milling technique. The as-synthesized Mg2Si ball-milled powders was exposed to the air atmosphere, intentionally, for self-combustion. The behaviour porous silicon derived from self-combustion of Mg2Si was compared with porous Si derived from the porous Si derived from heat treatment of Mg2Si. Electron microscopic investigations indicate the formation of various MgO morphology, and that resulted in samples with different pore sizes and surface areas. By preparing 5 wt% Si/graphite electrodes, the porous silicon derived from self-combustion of Mg2Si possesses a capacity of over 450 mAh/g, higher than graphite (350 mAh/g) over 200 cycles. The material with a larger size and pore volume performs better than the one with a smaller pore size and volume. Most interestingly, the production cost of Si-based anodes can be effectively reduced via this simple ball milling technique, thus this porous Si has great potential to be used as an anode additive in Lithium-ion battery applications.