Journal
JOURNAL OF POWER SOURCES
Volume 365, Issue -, Pages 257-265Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.08.094
Keywords
Large-format lithium-ion battery; Modeling and simulation; Semi-empirical cycle life model; Electrolyte depletion
Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry & Energy, Republic of Korea [20158510050020]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20158510050020] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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To overcome the limitation of simple empirical cycle life models based on only equivalent circuits, we attempt to couple a conventional empirical capacity loss model with Newman's porous composite electrode model, which contains both electrochemical reaction kinetics and material/charge balances. In addition, an electrolyte depletion function is newly introduced to simulate a sudden capacity drop at the end of cycling, which is frequently observed in real lithium-ion batteries (LIBs). When simulated electrochemical properties are compared with experimental data obtained with 20 Ah-level graphite/LiFePO4 LIB cells, our semi-empirical model is sufficiently accurate to predict a voltage profile having a low standard deviation of 0.0035 V, even at 5C. Additionally, our model can provide broad cycle life color maps under different c-rate and depth-of-discharge operating conditions. Thus, this semi-empirical model with an electrolyte depletion function will be a promising platform to predict long-term cycle lives of large-format LIB cells under various operating conditions. (C) 2017 Elsevier B.V. All rights reserved.
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