Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Research Trends in Coating Strategies for Residual Lithium Control in High-Nickel Li(NixCoyMn1-x-y)O2 Cathodes

고니켈 삼원계 층상구조 양극 물질의 잔류 리튬 제어를 위한 코팅 기술 연구 동향

  • Ui Yeoun Song (Department of Chemical Engineering, Chonnam National University) ;
  • Eun Ji Lee (Department of Chemical Engineering, Chonnam National University) ;
  • Ji Eun Lee (Department of Chemical Engineering, Chonnam National University)
  • 송의연 (전남대학교 화학공학부) ;
  • 이은지 (전남대학교 화학공학부) ;
  • 이지은 (전남대학교 화학공학부)
  • Received : 2024.05.13
  • Accepted : 2024.06.03
  • Published : 2024.06.10
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Abstract

Li(NixCoyMn1-x-y)O2 (NCM) is the intensively developed cathode material for expanding the electric vehicle market and developing lithium-ion batteries that meet higher capacity, longer life, and lower cost. High-nickel NCM increases the nickel content to 80% or more, securing price competitiveness by improving performance with high energy density and reducing the cost of cobalt. However, the high-nickel NCM materials have a residual lithium problem, leading to issues in battery performance degradation and stability. While various methods exist for removing residual lithium, such as washing, doping, and coating, this paper focuses on recent research trends in coatings aimed at enhancing NCM performance and stability by removing residual lithium.

Li(NixCoyMn1-x-y)O2 (NCM)은 전기 자동차 시장의 확대, 더 높은 용량과 긴 수명, 저렴한 가격을 충족하는 리튬이온 배터리 개발을 위해 집중적으로 개발되고 있는 양극재이다. 기존의 NCM을 발전시킨 고니켈 NCM (high-nickel NCM)은 니켈 함량을 80% 이상으로 높임으로써 높은 에너지 밀도로 개선된 성능과 원가가 높은 코발트의 감소로 가격 경쟁력을 확보하였다. 이러한 고니켈 NCM은 높아진 니켈의 함유량 때문에 잔류 리튬(residual lithium) 문제가 커지고, 이는 배터리 성능 저하와 안정성에 문제를 야기한다. 잔류 리튬을 제거하는 방식은 세척(washing), 도핑(doping), 코팅 (coating) 등의 여러 방식이 있지만, 본 논문에서는 잔류 리튬을 없애고, NCM의 성능 향상 및 안정성을 증가시키는 코팅에 대한 다양한 개발 동향을 중점적으로 최근 연구를 살펴보고자 한다.

Keywords

Acknowledgement

이 논문은 전남대학교 학술연구비(과제번호: 2022-2906) 지원 및 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임 (No. 2021R1A2C1011317).

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