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A Model for the Behavior of Battery Separators in Compression at Different Strain/Charge Rates

Author(s): Gor, GY; Cannarella, J; Prevost, Jean Herve; Arnold, Craig B

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Abstract: During charge and discharge of a lithium battery, intercalation of lithium ions into the electrodes can cause their noticeable expansion, compressing the soft separator between them. To assess the role of these effects on the battery performance, it is necessary to know the response of the battery separator under compressive loading. Here we develop a model for predicting the elastic response of a commercial separator immersed in fluid to compression at different strain rates. We show that the response of the separator is determined by combination of viscoelastic behavior of the polymer skeleton and poroelastic behavior, due to the flow of the fluid in the pores. Poroelastic behavior causes effective stiffening of the separator, which increases with the strain rate. For a sample of ca. 1 cm in diameter these effects become pronounced at strain rates ≥10-3 s-1 and have to be taken into account in coupled mechano-electrochemical models for lithium-ion batteries.
Publication Date: 16-Sep-2014
Electronic Publication Date: 16-Sep-2014
Citation: Gor, GY, Cannarella, J, Prevost, JH, Arnold, CB. (2014). A Model for the Behavior of Battery Separators in Compression at Different Strain/Charge Rates. Journal of the Electrochemical Society, 161 (11), F3065 - F3071. doi:10.1149/2.0111411jes
DOI: doi:10.1149/2.0111411jes
ISSN: 0013-4651
EISSN: 1945-7111
Pages: F3065 - F3071
Type of Material: Journal Article
Journal/Proceeding Title: Journal of the Electrochemical Society
Version: Final published version. This is an open access article.

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