Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Electrochemical Properties of SiOx Anode for Lithium-Ion Batteries According to Particle Size and Carbon Coating

입자 크기 및 탄소 코팅에 따른 리튬이온배터리용 SiOx 음극활물질의 전기화학적 특성

  • Anna Park (Department of Chemical Engineering, Chungbuk National University) ;
  • Byung-Ki Na (Department of Chemical Engineering, Chungbuk National University)
  • 박안나 (충북대학교 화학공학과) ;
  • 나병기 (충북대학교 화학공학과)
  • Received : 2023.11.23
  • Accepted : 2024.01.18
  • Published : 2024.02.01
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Abstract

In this study, the electrochemical properties of SiOx@C composite materials were prepared to alleviate volume expansion and cycle stability of silicon and to increase the capacity of anode material for LIBs. SiO2 particles of 100, 200, and 500 nm were synthesized by the Stӧber method, and reduced to SiOx (0≤x≤2) through the magnesiothermic reduction method. Then, SiOx@C anode materials were synthesized by carbonization of PVC on SiOx. The physical properties of prepared SiOx and SiOx@C anode materials were analyzed by XRD, SEM, TGA, Raman spectroscopy, XPS and BET. The electrochemical properties were investigated by cycling performance, rate performance, CV and EIS test. As a result, the SiOx@C-7030 manufactured by coating carbon at SiOx : C = 70 : 30 on a 100 nm SiOx with the smallest particle size showed the best electrochemical properties with a discharge capacity of 1055 mAh/g and a capacity retention rate of 81.9% at 100 cycles. It was confirmed that cycle stability was impoved by reducing particle size and carbon coating.

본 연구에서는 리튬이온배터리용 고용량 음극활물질인 실리콘의 부피팽창을 완화하고 사이클 안정성을 향상시키기 위해 SiOx@C 복합소재를 제조하였다. Stӧber 법을 통해 입자 크기가 각각 100, 200, 500 nm인 SiO2를 합성하였고, 마그네슘 열환원을 통해 SiOx (0≤x≤2)를 제조하였다. 그 후 SiOx에 PVC를 탄화시켜 SiOx와 C의 비율에 따라 SiOx@C 음극활물질을 합성하였다. 제조된 SiOx와 SiOx@C 음극활물질의 물리적 특성은 XRD, SEM, TGA, 라만분광법, XPS, BET를 사용해 분석하였다. 그리고 사이클 테스트, 율속특성, CV, EIS 테스트를 통해 전기화학적 특성을 조사하였다. 입자 크기가 가장 작은 100 nm SiOx에 SiOx:C=70:30으로 탄소를 코팅하여 제조된 SiOx@C-7030은 100 사이클에서 1055 mAh/g의 방전용량과 81.9%의 용량을 유지하여 가장 우수한 전기화학적 특성을 보여주었다. 이는 SiOx 음극활물질 입자의 크기를 줄이고, 탄소를 코팅하여 사이클 안정성을 향상시킬 수 있다는 것을 의미한다.

Keywords

References

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