화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Materials Research, Vol.32, No.4, 216-222, April, 2022
DOI10.3740/MRSK.2022.32.4.216  Export Citation
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, 홍순현, 전형권, 구자훈, 이희상, 최규석1, †, 김천중†
  • 충남대학교 신소재공학과
  • 1구미전자정보기술원
Minjeong Kim, Soonhyun Hong, Heongkwon Jeon, Jahun Koo, Heesang Lee, Gyuseok Choi1, †, and Chunjoong Kim†
  • Chungnam National University, 99, Daehak-ro, Yuseong-gu, Daejeon, Republic of Korea
  • 1Gumi Electronic and Information Technology Research Institute, Gumi, Gyeongbuk, 39171, Republic of Korea
E-mail:,
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.
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.
Keywords:lithium-ion battery;cathode;high-Ni cathode;core-shell;co-precipitation method
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