환원 공정을 이용한 실리콘 산화물의 제조 및 리튬 이온 배터리 음극재로의 적용
Preparation of silicon oxide particles using reduction process and the application as anode materials for lithium-ion batteries
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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, SiOx (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 SiOx through the magnesiothermic reduction reation (MRR) process and applied as an anode active material. The electrochemical characteristics of a SiOx/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.
Abstract
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, SiOx (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 SiOx through the magnesiothermic reduction reation (MRR) process and applied as an anode active material. The electrochemical characteristics of a SiOx/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.
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