Journal of Surface Science and Engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Size-controlled synthesis of silicon oxide nanoparticles and the application as anode materials in lithium-ion batteries

실리콘 산화물 나노입자의 크기 제어 합성 및 리튬이온전지 음극재로의 적용

  • Jeong-Yun Yang (Interdisciplinary Program in Advanced Functional Materials and Devices Development, Graduate School of Kangwon National University) ;
  • Eun Seok (Interdisciplinary Program in Advanced Functional Materials and Devices Development, Graduate School of Kangwon National University) ;
  • Goo-Hwan Jeong (Interdisciplinary Program in Advanced Functional Materials and Devices Development, Graduate School of Kangwon National University)
  • 양정윤 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정) ;
  • 석은 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정) ;
  • 정구환 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정)
  • Received : 2024.10.01
  • Accepted : 2024.10.07
  • Published : 2024.10.31
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Abstract

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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References

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