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리튬이차전지 성능 모사를 위한 전기화학적 모델링

A Review on Electrochemical Model for Predicting the Performance of Lithium Secondary Battery

  • 양승원 (대구경북과학기술원기초학부) ;
  • 김나연 (대구경북과학기술원기초학부) ;
  • 김은새 (대구경북과학기술원기초학부) ;
  • 임민홍 (대구경북과학기술원기초학부) ;
  • 박주남 (대구경북과학기술원에너지공학전공) ;
  • 송지훈 (대구경북과학기술원에너지공학전공) ;
  • 박선호 (대구경북과학기술원에너지공학전공) ;
  • ;
  • 유명현 (한밭대학교화학생명공학과) ;
  • 이용민 (대구경북과학기술원에너지공학전공)
  • Yang, Seungwon (College of Transdisciplinary Studies, Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Kim, Nayeon (College of Transdisciplinary Studies, Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Kim, Eunsae (College of Transdisciplinary Studies, Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Lim, Minhong (College of Transdisciplinary Studies, Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Park, Joonam (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Song, Jihun (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Park, Sunho (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Appiah, Williams Agyei (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST)) ;
  • Ryou, Myung-Hyun (Department of Chemical and Biological Engineering, Hanbat National University) ;
  • Lee, Yong Min (Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST))
  • 투고 : 2019.02.08
  • 심사 : 2019.02.16
  • 발행 : 2019.02.28

초록

리튬이차전지(Lithium Secondary Batteries)를 에너지원으로 채용하는 분야가 다양해짐에 따라, 기존 요구 특성뿐만 아니라 각 분야에 특화된 성능 평가 결과까지 요구하고 있다. 이에 대응하기 위해 각 전지 제조사는 연구 인력을 충원하고 고가의 장비를 지속적으로 도입해서 다수의 전지를 오랜 기간 평가해야 하는 어려움을 겪고 있다. 이를 해소하기 위해, 전지 모델링(Modeling)을 기반으로 한 모사(Simulation) 기법을 도입하여, 실험 횟수를 최소화하고 실험 시간도 단축하려는 시도를 지속하고 있다. 현재까지 다양한 리튬이차전지 모델링 기법이 보고되고 있으며, 목적에 따라 최적 기법이 선택 및 활용되어 왔다. 본 리뷰 논문에서는 뉴만(Newman) 모델을 기반으로 한 전기화학적 모델링(Electrochemical Modeling) 기법을 상세히 설명한다. 특히, 전극 반응속도를 나타내는 버틀러-볼머식(Butler-Volmer Equation), 각 상(Phase)에서 전자와 이온의 균형 방정식 (Material and Charge Balance Equations), 그리고 전지의 온도 변화를 설명할 수 있는 에너지 균형 방정식 (Energy Balance Equation)의 물리적 의미를 쉽게 설명하고, COMSOL Multiphysics를 이용한 간단한 해석 과정과 결과를 제시한다.

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Fig. 1. Scale-specific modeling approach in lithium secondary battery system

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Fig. 3. The molar flux at the solid surface due to migration.

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Fig. 4. Change of Li-ion concentration in electrolyte over time.

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Fig. 5. Change of Li-ion concentration in electrode active material over time.

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Fig. 6. Overpotential change in the electrolyte with time and distance.

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Fig. 7. Potential change in the electrode with time and distance between anode and cathode.

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Fig. 8. Flow chart of electrochemical modeling.

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Fig. 2. (a) Overpotential – Current density graph with symmetry factor change, (b) Overpotential – Current density graph with change of equilibrium exchange current density.

과제정보

연구 과제 주관 기관 : Daegu Gyeongbuk Institute of Science & Technology (DGIST)

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