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논문 기본 정보

자료유형
학술저널
저자정보
양정윤 (강원대학교) 석은 (강원대학교) 정구환 (강원대학교)
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한국표면공학회 한국표면공학회지 한국표면공학회지 제57권 제5호
발행연도
2024.10
수록면
425 - 431 (7page)

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As demand in the electric vehicle market increases, the development of high capacity, high energy density lithium-ion batteries (LIBs) is required. Silicon has a extremely high theoretical capacity of 4200 mAh/g, but low cycle life and structural instability due to high volume expansion during charging and discharging are critical issue to solve. A reduced silicon oxide has also a high theoretical capacity of 2500 mAh/g and recently studied extensively for its low-cost, superior cycle life, and structural stability.
In this study, we first synstheized SiO₂ particles by sol-gel method using tetraethyl orthosilicate (TEOS) precursor. The SiO₂ particle size was controlled with an average particle size of 300-600 nm by the addition amount of TEOS, NH₃, and H₂O. The synthesized SiO₂ particles were reduced to SiOx through the magnesiothermic reduction reaction (MRR), and electrochemical characteristics were evaluated according to the particle size of SiOx.
For electrochemical characterization, SiOx (10 wt.%) was mixed with graphite, and 2032 half cells were fabricated to obtain charge-discharge curve, cycle performance, rate performance, and electrochemical impedance spectroscopy curves. As a result, the mean size of SiOx particle decreases from 600 to 300 nm, the initial discharge capacity increases from 459.9 to 556.5 mAh/g with the single capacity from 1359.4 to 2325.3 mAh/g, respectively. Finally, the present result shows the availability of MRR process to obtain reduced silicon oxide particles and sized dependent electrochemical properties to develop high capacity and high energy density LIBs.

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Abstract
1. 서론
2. 실험 방법
3. 결과 및 고찰
4. 결론
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