한국재료학회지 (Korean Journal of Materials Research)

  • 제32권4호
  • /
  • Pages.216-222
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  • 2022
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  • 1225-0562(pISSN)
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  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
권호 표지
DOI QR코드

DOI QR Code

공침법을 통하여 합성된 코어-쉘 구조를 가지는 하이 니켈 양극 소재 안정화

Stabilization of High Nickel Cathode Materials with Core-Shell Structure via Co-precipitation Method

  • 김민정 (충남대학교 신소재공학과) ;
  • 홍순현 (충남대학교 신소재공학과) ;
  • 전형권 (충남대학교 신소재공학과) ;
  • 구자훈 (충남대학교 신소재공학과) ;
  • 이희상 (충남대학교 신소재공학과) ;
  • 최규석 (구미전자정보기술원) ;
  • 김천중 (충남대학교 신소재공학과)
  • 투고 : 2022.04.14
  • 심사 : 2022.04.18
  • 발행 : 2022.04.27
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초록

The capacity of high nickel Li(NixCoyMn1-x-y)O2 (NCM, x ≥ 0.8) cathodes is known to rapidly decline, a serious problem that needs to be solved in a timely manner. It was reported that cathode materials with the {010} plane exposed toward the outside, i.e., a radial structure, can provide facile Li+ diffusion paths and stress buffer during repeated cycles. In addition, cathodes with a core-shell composition gradient are of great interest. For example, a stable surface structure can be achieved using relatively low nickel content on the surface. In this study, precursors of the high-nickel NCM were synthesized by coprecipitation in ambient atmosphere. Then, a transition metal solution for coprecipitation was replaced with a low nickel content and the coprecipitation reaction proceeded for the desired time. The electrochemical analysis of the core-shell cathode showed a capacity retention of 94 % after 100 cycles, compared to the initial discharge capacity of 184.74 mA h/g. The rate capability test also confirmed that the core-shell cathode had enhanced kinetics during charging and discharging at 1 A/g.

키워드

과제정보

This study was funded by the government (Ministry of Trade, Industry, and Energy) and supported by the Materials/Parts Technology Development Program of the Korea Evaluation Institute of Industrial Technology (20011287).

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