Synthesis of Silicon/Silica/Carbon Composite from Rice Husk via Mechanical Milling Method as Anode Lithium-Ion Batteries

Mohamad Alief Ramdhan, Nindya Tri Muliawati

Abstract


Silicon (Si) and silicon dioxide (SiO₂), with high theoretical capacities of 4200 mAh g⁻¹ and 1965 mAh g⁻¹ respectively, have attracted considerable interest as potential anode materials for lithium-ion batteries (LIBs), especially when derived from abundant and renewable sources like rice husk (RH). However, their practical applications are hindered by major challenges, such as significant volume expansion (100%–300%) during charge/discharge cycles and inherently low electrical conductivity (~10⁻¹ S m⁻¹). This study aims to develop a low-cost, sustainable, and high-performance Si/SiO₂/C composite anode material from rice husk using a combination of mechanical milling and AlCl₃/NaCl-activated aluminothermic reduction. The work specifically explores the effects of single-step versus two-step milling processes on the structural integrity and electrochemical performance of the resulting composites. The two-step milling method, a relatively new and more controlled approach, effectively eliminated unwanted metal oxide by-products, as confirmed by X-ray diffraction (XRD) analysis. In contrast, the single-step process resulted in residual impurities. Electrochemical tests revealed that the two-step Si/SiO₂/C composite delivered a significantly higher specific capacity of 280.01 mAh g⁻¹ after 50 cycles, compared to 146.15 mAh g⁻¹ from the single-step method. These results highlight the potential of rice husk-derived Si/SiO₂/C composites as eco-friendly and efficient anode materials for next-generation LIBs.

Keywords


aluminothermic reduction; lithium-ion battery; mechanical milling; rice husk; Si/Sio₂/C Composite

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References


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DOI: https://doi.org/10.33394/hjkk.v13i3.16618

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