전기화학회지 (Journal of the Korean Electrochemical Society)

  • 제22권3호
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  • Pages.112-121
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  • 2019
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  • 1229-1935(pISSN)
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  • 2288-9000(eISSN)
한국전기화학회 (The Korean Electrochemical Society)
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리튬이차전지용 음극활물질로서 Micro sized Silicon/CNT/Carbon 복합입자의 전기화학적 특성

Electrochemical Performance of Micro Sized Silicon/CNT/Carbon Composite as Anode Material for Lithium Ion Batteries

  • 신민선 (강원대학교신소재공학과) ;
  • 이태민 (강원대학교신소재공학과) ;
  • 이성만 (강원대학교신소재공학과)
  • Shin, Min-Seon (Department of Advanced Materials Science and Engineering, Kangwon National University) ;
  • Lee, Tae-Min (Department of Advanced Materials Science and Engineering, Kangwon National University) ;
  • Lee, Sung-Man (Department of Advanced Materials Science and Engineering, Kangwon National University)
  • 투고 : 2019.07.13
  • 심사 : 2019.08.12
  • 발행 : 2019.08.31
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초록

본 연구에서는 마이크로 크기의 실리콘 입자와 탄소나노튜브를 활용하여 고용량을 갖는 실리콘/탄소나노튜브/탄소 복합입자를 제조하여 리튬이차전지용 음극활물질로서의 적용가능성을 확인하고자 하였다. 실리콘/탄소나노튜브/탄소 복합입자 제조를 위해 분무건조 방식을 이용하여 실리콘입자가 탄소나노튜브에 의해 균일하게 분산되어 비정질탄소로 결합된 구조를 갖는 구형의 복합입자를 제조하였다. 제조한 복합입자는 실리콘 입자 주변에 탄소나노튜브의 네트워크 구조를 형성하며 비정질 탄소에 의해 실리콘 입자와 탄소나노튜브의 입자들이 결합한 상태를 유지하는 구조로 이루어진다. 이러한 복합입자의 구조적인 특성으로 인해 계속적인 충방전 과정에서 실리콘의 부피팽창이 효과적으로 완충되고 이에 따라 전기적 접촉 손실 및 SEI 막 형성에 따른 비가역 반응이 제어되어 우수한 수명 특성 및 충전출력 특성을 갖는 것으로 나타난다.

In this study, silicon / carbon nanotube / carbon composite particles with high capacity were fabricated by using micro-sized silicon particles and carbon nanotubes as an anode material for lithium ion batteries. The silicon / carbon nanotube / carbon composite particles were prepared by spray drying method to prepare spherical composite particles. The composite particles have the network structure of the carbon nanotubes around the silicon particles, in which the silicon particles and the carbon nanotubes are bonded by amorphous carbon. It appears that the volume expansion of silicon is effectively buffered and the electrical contact is maintained in the network structure of the composite particles during charge-discharge cycles.

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