期刊
EXTREME MECHANICS LETTERS
卷 40, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.eml.2020.100960
关键词
Lithium-ion batteries; Separators; Electrolyte wetting; Wettability; Production process
资金
- Office of Energy Efficiency and Renewable Energy (EERE) Vehicle Technologies Office (VTO) Applied Battery Research subprogram, USA [DE-AC05-00OR22725]
- Small Scale Systems Integration and Packaging (S3IP) Center of Excellence - New York Empire State Development's Division of Science, Technology and Innovation, USA
The wettability by electrolyte is a critical characteristic of lithium-ion battery separators since electrolyte absorption is essential for ionic transport. Most importantly, fast absorption of electrolyte facilitates the electrolyte filling and wetting processes during the battery assembly. However, theoretical or experimental investigation of separator wettability has rarely been reported, and thus very little quantitative data can be found in the existing literature. In this study, innovative experimental techniques and associated analytical models have been developed to fully characterize the electrolyte wetting behavior through battery separators. Both in-plane and through-plane imbibition processes are investigated. The results show that, electrolyte needs significantly longer time to wet separators than it does for commercial electrodes. The wetting rate depends significantly on the pore size, porosity, and micro-structure of the separators. Electrolyte in-plane wetting is only observed in the separators manufactured by the wet process. Increasing separator porosity and pore size is shown to be substantially increasing through-plane wetting rate. In addition, ceramic coating is shown to increase in-plane wetting but retard through-plane wetting. (C) 2020 Elsevier Ltd. All rights reserved.
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