Journal of the Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회논문집)

Korean Society for Geothermal and Hydrothermal Energy (한국지열·수열에너지학회)
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Numerical analysis on thermal runaway by cathode active materials in lithium-ion batteries

리튬이온전지 열폭주에 대해 양극활물질이 미치는 영향에 대한 수치해석적 연구

  • Gang, Myung-Bo (Department of Mechanical Engineering, Jeju National University) ;
  • Kim, Nam-Jin (Department of Mechanical Engineering, Jeju National University)
  • 강명보 (제주대학교 기계공학과) ;
  • 김남진 (제주대학교 기계공학과)
  • Received : 2021.04.09
  • Accepted : 2021.05.27
  • Published : 2021.06.01
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Abstract

Lithium-ion batteries with high energy density, long cycle life and other advantages, have been widely used to energy storage systems(ESS). But as ESS fires frequently occur, the safety concern has become the main obstacle that hinders the large-scale applications of lithium-ion batteries. Especially, thermal runaway is the key scientific problem in battery safety research. Therefore, in this study, we performed a numerical analysis on the thermal runaway phenomenon of NCM111, NCM523 and NCM622 batteries using a two-dimensional analysis model. The results show that the two-dimensional simulation results are generally matched with three-dimensional simulation. Also, In the case of NCM111 with a low Ni content in the temperature range used in this study, thermal runaway phenomenon does occurred very slowly, but as the Ni content is increased, the thermal runaway phenomenon occurs rapidly and the thermal stability tends to be decreased. And, in NCM523 and NCM622 batteries, chain reactions occur almost simultaneously, but in the case of NCM111 battery, it is found that after the SEI(Solid Electrolyte Interface) layer decomposition reaction, the cathode-electrolyte reaction is appeared sequentially. After that, the anodic decomposition reaction is increased and leads to the thermal runaway reaction.

Keywords

Acknowledgement

이 논문은 2020학년도 제주대학교 교원성과 지원사업에 의하여 연구되었음.

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