한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제57권4호
  • /
  • Pages.317-324
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  • 2024
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
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LiFePO4 분말 위 탄소나노튜브의 직접 성장과 리튬이온전지 양극재로의 적용

Direct growth of carbon nanotubes on LiFePO4 powders and the application as cathode materials in lithium-ion batteries

  • 한현호 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정) ;
  • 이종환 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정) ;
  • 정구환 (강원대학교 대학원 고기능 소자 및 소재 기술 고도화 협동과정)
  • Hyun-Ho Han (Interdisciplinary Program in Advanced Functional Materials and Devices Development, Graduate School of Kangwon National University) ;
  • Jong-Hwan Lee (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)
  • 투고 : 2024.07.21
  • 심사 : 2024.07.24
  • 발행 : 2024.08.31
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초록

We demonstrate a direct growth of carbon nanotubes (CNTs) on the surface of LiFePO4 (LFP) powders for use in lithium-ion batteries (LIB). LFP has been widely used as a cathode material due to its low cost and high stability. However, there is a still enough room for development to overcome its low energy density and electrical conductivity. In this study, we fabricated novel structured composites of LFP and CNTs (LFP-CNTs) and characterized the electrochemical properties of LIB. The composites were prepared by direct growth of CNTs on the surface of LFP using a rotary chemical vapor deposition. The growth temperature and rotation speed of the chamber were optimized at 600 ℃ and 5 rpm, respectively. For the LIB cell fabrication, a half-cell was fabricated using polytetrafluoroethylene (PTFE) and carbon black as binder and conductive additives, respectively. The electrochemical properties of LIBs using commercial carbon-coated LFP (LFP/C), LFP with CNTs grown for 10 (LFP/CNTs-10m) and 30 min(LFP/CNTs-30m) are comparatively investigated. For example, after the formation cycle, we obtained 149.3, 160.1, and 175.0 mAh/g for LFP/C, LFP/CNTs-10m, and LFP/CNTs-30m, respectively. In addition, the improved rate performance and 111.9 mAh/g capacity at 2C rate were achieved from the LFP/CNTs-30m sample compared to the LFP/CNTs-10m and LFP/C samples. We believe that the approach using direct growth of CNTs on LFP particles provides straightforward solution to improve the conductivity in the LFP-based electrode by constructing conduction pathways.

키워드

과제정보

본 과제(결과물)는 교육부와 한국연구재단의 재원으로 지원을 받아 수행된 3단계 산학연협력 선도대학 육성사업(LINC 3.0)의 연구결과입니다.

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