Journal of the Korean Electrochemical Society (전기화학회지)

The Korean Electrochemical Society (한국전기화학회)
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Review on Effective Skills to Inhibit Dendrite Growth for Stable Lithium Metal Electrode

리튬금속전극의 덴드라이트 성장 억제 방안의 연구 동향

  • Kim, Yerang (Department of Chemical Engineering, the University of Seoul) ;
  • Park, Jihye (Department of Chemical Engineering, the University of Seoul) ;
  • Hwang, Yujin (Department of Chemical Engineering, the University of Seoul) ;
  • Jung, Cheolsoo (Department of Chemical Engineering, the University of Seoul)
  • 김예랑 (서울시립대학교 화학공학과) ;
  • 박지혜 (서울시립대학교 화학공학과) ;
  • 황유진 (서울시립대학교 화학공학과) ;
  • 정철수 (서울시립대학교 화학공학과)
  • Received : 2022.02.26
  • Accepted : 2022.04.12
  • Published : 2022.05.31
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Abstract

Although lithium metal batteries have a high energy density, experimental skills capable of solving lots of problems induced by dendrite such as short circuit, low coulomb efficiency, capacity loss, and cycle performance are still only in academic research stage. In this paper, research cases for dendrite growth inhibition on lithium metal electrode were classified into four types: flexible SEI (solid electrolyte interface) layer responding to volume expansion of lithium metal electrode, SEI supporting layer to inhibit dendrite growth physically, SHES (self-healing electrostatic shield) mechanism to adjust lithium growth by leading uniform diffusion of Li+ ions, and finally micro-patterning to induce uniform deposition of lithium. We hope to advance the practical use of lithium metal electrode by analyzing pros and cons of this classification.

리튬금속전지는 높은 에너지 밀도를 구현시킬 수 있음에도 불구하고, 단락, 낮은 쿨롱 효율, 용량 손실, 사이클 성능 감소 등의 문제를 초래하는 덴드라이트 성장을 억제시키는 기술은 아직 학술연구 단계에 머물러 있다. 본 논문에서는 최근까지 발표된 리튬금속전극에서 덴드라이트 성장을 억제시킬 수 있는 방법을 4가지로 분류하여 분석해보았다. 즉, 리튬금속전극의 부피 팽창에 대응할 수 있는 유연한 SEI (solid electrolyte interface) 층, 덴드라이트 성장을 물리적으로 억제시킬 수 있는 SEI 지지층, 균일한 리튬 확산을 유도하여 리튬 성장을 조절하는 SHES (self-healing electrostatic shield) 메커니즘, 그리고 리튬의 균일한 전착을 유도하는 마이크로패터닝 등에 대해 연구된 사례들의 장단점을 분석하여, 리튬금속전극의 실용화 연구에 도움을 주고자 한다.

Keywords

Acknowledgement

This work was supported by the 2020 sabbatical year research grant of the University of Seoul.

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