Journal
EXTREME MECHANICS LETTERS
Volume 37, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.eml.2020.100705
Keywords
Lithium-ion batteries; Polymeric separator; Microstructural reconstruction; Battery safety; Polymeric materials; Mechanical deformation
Funding
- MIT Battery Modeling Consortium (Altair)
- MIT Battery Modeling Consortium (AVL)
- MIT Battery Modeling Consortium (Boston-Power)
- MIT Battery Modeling Consortium (Dassault Systemes)
- MIT Battery Modeling Consortium (Jaguar-Land Rover)
- MIT Battery Modeling Consortium (LG Chem)
- MIT Battery Modeling Consortium (Mercedes-Benz Research & Development North America)
- MIT Battery Modeling Consortium (Murata)
- MIT Battery Modeling Consortium (PSA Groupe)
- Ford Motor Company, USA through the Ford-MIT Alliance
- USAID
- department of mechanical engineering at UConn, USA
- International Science & Technology Cooperation Program of China [2016YFE0102200]
- National Natural Science Foundation of China [51675294]
- China Scholarship Council (CSC)
- Studienstiftung des deutschen Volkes
Ask authors/readers for more resources
Dry-processed polyolefin film is currently the most widely-applied type of separators for commercial lithium-ion batteries. Its porous structure could undergo large deformation during normal charging-discharging cycles, affecting the mass transfer process through the electrolyte, and during mechanical abuse loadings, leading to the direct contact between the positive and the negative electrodes and the subsequent electrical short circuit. In this study, we investigate its deformation pattern experimentally via mechanical testing with post-mortem microscopic examinations, numerically via an image-based microstructural modeling technology, and theoretically via an analytical model based on the principle of minimum energy. The developed models and theories provide high-fidelity predictions of the deformation patterns under different conditions compared with the experimental observations. (C) 2020 Elsevier Ltd. All rights reserved.
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