• Journal of Industrial Technology
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• v.44 no.1
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• pp.35-42
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• 2024

Silicon has a theoretical capacity of about 3,579 mAh/g higher than graphite, but it has limitations such as capacity reduction and low coulombic efficiency due to volume expansion of more than 300% during charging and discharging. To solve this problem, research on silicon-based anode materials is actively underway. Among silicon-based anode materials, SiO_x (0<x<2) is easy to synthesize, and the expansion stress is relieved by lithium oxides produced during initial charging and discharging, making it a relatively stable material compared to silicon and silicon alloys. In this study, silicon oxide (SiO₂) particles were synthesized using a simple sol-gel method with sodium silicate solution as the silicon precursor. The synthesized SiO₂ particles were then reduced to SiO_x through the magnesiothermic reduction reation (MRR) process and applied as an anode active material. The electrochemical characteristics of a SiO_x/graphite blend (10:90 wt.%) were evaluated. We found that the the initial discharge capacity tends to increase and the capacity retention rate tends to decrease as the reduction temperature increases.