한국표면공학회지 (Journal of the Korean institute of surface engineering)

  • 제56권1호
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  • Pages.104-114
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  • 2023
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  • 1225-8024(pISSN)
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  • 2288-8403(eISSN)
한국표면공학회 (The Korean Institute of Surface Engineering)
권호 표지
DOI QR코드

DOI QR Code

리튬이차전지용 고용량 음극을 위한 구리@코발트산화물 코어-쉘 수지상 기반 3차원 다공성 박막

Three-dimensional porous films consisting of copper@cobalt oxide core-shell dendrites for high-capacity lithium secondary batteries

  • 주소영 (부산대학교 재료공학과) ;
  • 최윤주 (부산대학교 재료공학과) ;
  • 최우성 (부산대학교 재료공학과) ;
  • 신헌철 (부산대학교 재료공학과)
  • So-Young Joo (School of Materials Science and Engineering, Pusan National University) ;
  • Yunju Choi (School of Materials Science and Engineering, Pusan National University) ;
  • Woo-Sung Choi (School of Materials Science and Engineering, Pusan National University) ;
  • Heon-Cheol Shin (School of Materials Science and Engineering, Pusan National University)
  • 투고 : 2022.01.10
  • 심사 : 2023.02.14
  • 발행 : 2023.02.28
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초록

Three dimensional (3D) porous structures consisting of Cu@CoO core-shell-type nano-dendrites were synthesized and tested as the anode materials in lithium secondary batteries. For this purpose, first, the 3D porous films comprising Cu@Co core-shell-type nano-dendrites with various thicknesses were fabricated through the electrochemical co-deposition of Cu and Co. Then the Co shells were selectively anodized to form Co hydroxides, which was finally dehydrated to get Cu@CoO nanodendrites. The resulting electrodes exhibited very high reversible specific capacity almost 1.4~2.4 times the theoretical capacity of commercial graphite, and excellent capacity retention (~90%@50th cycle) as compared with those of the existing transition metal oxides. From the analysis of the cumulative irreversible capacity and morphology change during charge/discharge cycling, it proved that the excellent capacity retention was attributed to the unique structural feature of our core-shell structure where only the thin CoO shell participates in the lithium storage. In addition, our electrodes showed a superb rate performance (70.5%@10.8 C-rate), most likely due to the open porous structure of 3D films, large surface area thanks to the dendritic structure, and fast electron transport through Cu core network.

키워드

과제정보

이 과제는 부산대학교 기본연구지원사업(2년)에 의하여 연구되었음.

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