Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Synthesis of Si-CNT-C Composites and Their Application to Lithium Ion Battery

실리콘-탄소나노튜브-탄소 복합체 제조 및 리튬이온전지 응용

  • Kim, Chan Mi (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Sun Kyung (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Chang, Hankwon (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Kil, Dae sup (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Jang, Hee Dong (Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources)
  • 김찬미 (한국지질자원연구원 자원활용연구센터) ;
  • 김선경 (한국지질자원연구원 자원활용연구센터) ;
  • 장한권 (한국지질자원연구원 자원활용연구센터) ;
  • 길대섭 (한국지질자원연구원 자원활용연구센터) ;
  • 장희동 (한국지질자원연구원 자원활용연구센터)
  • Received : 2017.09.15
  • Accepted : 2018.01.03
  • Published : 2018.02.01
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Abstract

Silicon has attracted extensive attention due to its high theoretical capacity, low discharge potential and non-toxicity as anode material for lithium ion batteries. In this study, Si-CNT-C composites were fabricated for use as a high-efficiency anode material in a lithium ion battery. Aerosol self-assembly and post-heat treatment processes were employed to fabricate the composites. The morphology of the Si-CNT-C composites was spherical and an average particle size was $2.72{\mu}m$. The size of the composite increased as concentration of Si and CNT increased in the precursor solution. In the Si-CNT-C composites, CNT and C carbonized from glucose were attached to the surface of Si particles. Electrochemical measurement showed that the cycle performance of Si-CNT-C composites was better than that of silicon particles.

리튬이온전지의 음극재로 높은 이론적인 용량과 낮은 방전 전위 및 무독성을 가진 실리콘이 높은 관심을 받고 있다. 본 연구에서는 리튬이온전지의 고효율 음극재로 활용을 위한 실리콘-탄소나노튜브-탄소(Si-CNT-C) 복합체를 제조하였다. 복합체 제조를 위해서는 에어로졸 자기조립과 후 열처리 공정을 사용하였다. 제조된 Si-CNT-C 복합체는 구형이었으며 평균 입자크기는 $2.72{\mu}m$이었다. 복합체의 크기는 실리콘 및 탄소나노튜브의 농도가 증가할수록 커지는 것을 확인하였다. Si-CNT-C 복합체는 탄소나노튜브와 글루코스에서 탄화된 탄소가 실리콘 입자들을 중심으로 표면에 부착된 형태이었다. 제조된 Si-CNT-C 복합체는 전기화학 분석을 통해 순수한 실리콘보다 우수한 사이클 성능을 보여주고 있음을 확인하였다.

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