Strain distribution and failure mode of polymer separators for Li-ion batteries under biaxial loading

Kalnaus, Sergiy; Kumar, Abhishek; Wang, Yanli; Li, Jianlin; Simunovic, Srdjan; Turner, John A.; Gorney, Phillip

doi:10.1016/j.jpowsour.2017.12.029

Title: Strain distribution and failure mode of polymer separators for Li-ion batteries under biaxial loading

Journal Article · Fri Dec 15 23:00:00 EST 2017 · Journal of Power Sources

DOI: https://doi.org/10.1016/j.jpowsour.2017.12.029 · OSTI ID:1414699

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational Sciences and Engineering Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Energy and Transportation Science Division
National Highway Safety and Transportation Administration, Washington, DC (United States)

Deformation of polymer separators for Li-ion batteries has been studied under biaxial tension by using a dome test setup. This deformation mode provides characterization of separator strength under more complex loading conditions, closer representing deformation of an electric vehicle battery during crash event, compared to uniaxial tension or compression. Two polymer separators, Celgard 2325 and Celgard 2075 were investigated by deformation with spheres of three different diameters. Strains in separators were measured in situ by using Digital Image Correlation (DIC) technique. The results show consistent rupture of separators along the machine direction coinciding with areas of high strain accumulation. The critical first principal strain for failure was independent of the sphere diameter and was determined to be approximately 34% and 43% for Celgard 2325 and Celgard 2075 respectively. These values can be taken as a criterion for internal short circuit in a battery following an out-of-plane impact. A Finite Element (FE) model was built with the anisotropic description of separator behavior, derived from tensile tests in orthogonal directions. In conclusion, the results of simulations predicted the response of separator rather well when compared to experimental results for various sizes of rigid sphere.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1414699

Journal Information:: Journal of Power Sources, Journal Name: Journal of Power Sources Journal Issue: C Vol. 378; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (2)

Multifunctional nanocomposite structural separators for energy storage Acauan, Luiz H.; Zhou, Yue; Kalfon-Cohen, Estelle Nanoscale, Vol. 11, Issue 45 https://doi.org/10.1039/c9nr06954b	journal	January 2019
Elucidation of Separator Effect on Energy Density of Li-Ion Batteries Parikh, Dhrupad; Christensen, Tommiejean; Hsieh, Chien-Te Journal of The Electrochemical Society, Vol. 166, Issue 14 https://doi.org/10.1149/2.0571914jes	journal	January 2019

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