Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Enhanced High-Temperature Performance of LiNi0.6Co0.2Mn0.2O2 Positive Electrode Materials by the Addition of nano-Al2O3 during the Synthetic Process

LiNi0.6Co0.2Mn0.2O2 양극 활물질의 합성공정 중 나노크기 알루미나 추가에 의한 고온수명 개선

  • Park, Ji Min (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Kim, Daeun (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Kim, Hae Bin (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Bae, Joong Ho (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Lee, Ye-Ji (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Myoung, Jae In (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Hwang, Eunkyoung (Department of Chemical Engineering and Biotechnology, Korea Polytechnic University) ;
  • Yim, Taeeun (Department of Chemistry, Incheon National University) ;
  • Song, Jun Ho (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Yu, Ji-Sang (Advanced Batteries Research Center, Korea Electronics Technology Institute) ;
  • Ryu, Ji Heon (Graduate School of Knowledge-Based Technology and Energy, Korea Polytechnic University)
  • 박지민 (한국산업기술대학교 생명화학공학과) ;
  • 김다은 (한국산업기술대학교 생명화학공학과) ;
  • 김해빈 (한국산업기술대학교 생명화학공학과) ;
  • 배중호 (한국산업기술대학교 생명화학공학과) ;
  • 이예지 (한국산업기술대학교 생명화학공학과) ;
  • 명재인 (한국산업기술대학교 생명화학공학과) ;
  • 황은경 (한국산업기술대학교 생명화학공학과) ;
  • 임태은 (인천대학교 화학과) ;
  • 송준호 (전자부품연구원 차세대전지연구센터) ;
  • 유지상 (전자부품연구원 차세대전지연구센터) ;
  • 류지헌 (한국산업기술대학교 지식기반기술.에너지대학원)
  • Received : 2016.05.30
  • Accepted : 2016.06.15
  • Published : 2016.08.31
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Abstract

High Ni content layered oxide materials for the positive electrode in lithium-ion batteries have high specific capacity. However, their poor electrochemical and thermal stability at elevated temperature restrict the practical use. A small amount of $Al_2O_3$ was added to the mixture of transition metal hydroxide and lithium hydroxide. The $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ was simultaneously doped and coated with $Al_2O_3$ during heat-treatment. Electrochemical characteristics of modified $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ were evaluated by the galvanostatic cycling and the LSTA(linear sweep thermmametry) at the constant voltage conditions. The nano-sized $Al_2O_3$ added materials show better cycle performance at elevated temperature than that of micro-sized $Al_2O_3$. As the added amount of nano-$Al_2O_3$ increased, the thermal stability of electrode also enhanced, but the use of 2.5 mol% Al showed the best high temperature performance.

리튬이온 이차전지의 고용량화를 위해 high-Ni계 양극 활물질이 크게 주목받고 있으나, Ni 함량이 높아짐에 따라 고온 안정성이 감소하여 수명저하가 발생하게 된다. 본 연구에서는 $LiNi_{0.6}Co_{0.2}Mn_{0.2}O_2$ (NCM622)의 합성공정 중에서 전구체인 전이금속 수산화물과 리튬염의 열처리 과정에 알루미나 입자를 첨가함으로써 추가적인 표면처리 공정없이 활물질 특성을 개선시키고자 하였다. 알루미나를 첨가하게 되면 고온 사이클 수명이 개선되었으며, 특히 나노크기의 알루미나를 사용하는 경우에 초기용량의 감소도 적고 수명도 개선됨을 확인하였다. 그리고, 나노 알루미나를 함량별로 추가한 결과로 표면형상이 점차 변화함과 동시에 격자상수의 감소가 발생하는 것이 관찰되어 표면코팅과 구조 내 치환이 동시에 발생하고 있음을 확인하였다. LSTA (linear-sweep thermmametry)를 사용하여 알루미나의 함량이 증가할 수록 부반응이 감소하며 고온 안정성이 증가하는 것을 확인하였다. 또한 전이금속 대비 Al을 2.5 mol% 추가하는 경우에 가장 우수한 고온 사이클 성능이 나타나는 것을 확인하였다.

Keywords

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