Mechanical behavior and failure mechanisms of Li-ion battery separators

Kalnaus, Sergiy; Wang, Yanli; Turner, John A.

doi:10.1016/j.jpowsour.2017.03.003

Title: Mechanical behavior and failure mechanisms of Li-ion battery separators

Journal Article · Thu Mar 09 00:00:00 EST 2017 · Journal of Power Sources

DOI:https://doi.org/10.1016/j.jpowsour.2017.03.003· OSTI ID:1346671

Kalnaus, Sergiy ^[1]; Wang, Yanli ^[2]; Turner, John A. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computer Science and Mathematics Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

We determine and compare anisotropic mechanical properties for three types of commercially available Li-ion battery separators: Celgard 2325, Celgard PP2075 dry-processed polymer separators, and DreamWeaver Gold 40 non-woven separator. Significant amount of anisotropy of properties was determined, with the Young's modulus being different by up to a factor of 5 and ultimate strength being different by a factor of 10 between orthogonal directions within a polymer separator layer. Strain rate sensitivity was investigated by applying strain rates ranging from 1•10^-4 s^-1 to 0.1 s^-1. Significant strengthening was observed and the strain rate strengthening coefficients were determined for both elastic modulus and yield stress in case of polymer separators. Digital image correlation technique was used to measure and map the strains over the specimen's gage section. A significant strain concentration in bands running perpendicular to the tensile axis was observed in polymer separator samples oriented in transverse direction. Such localized necking allows for extremely high strains close to 300% to develop in the material. Furthermore, the failure mode was remarkably different for all three types of separators which adds additional variable in safe design of Li-ion batteries for prevention of internal short circuits.

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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), Vehicle Technologies Office (EE-3V); USDOE Office of Energy Efficiency and Renewable Energy (EERE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1346671

Alternate ID(s):: OSTI ID: 1397416

Journal Information:: Journal of Power Sources, Vol. 348, Issue C; ISSN 0378-7753

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 94 works

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General Model of Temperature-dependent Modulus and Yield Strength of Thermoplastic Polymers Huang, Ping-Yuan; Guo, Zhan-Sheng; Feng, Jie-Min Chinese Journal of Polymer Science, Vol. 38, Issue 4 https://doi.org/10.1007/s10118-020-2360-7	journal	December 2019
Safety Performance of 5 Ah Lithium Ion Battery Cells Containing the Flame Retardant Electrolyte Additive (Phenoxy) Pentafluorocyclotriphosphazene Dagger, Tim; Meier, Vladislav; Hildebrand, Stephan Energy Technology, Vol. 6, Issue 10 https://doi.org/10.1002/ente.201800131	journal	August 2018
Bombyx mori Silkworm Cocoon Separators for Lithium‐Ion Batteries with Superior Safety and Sustainability Pereira, Rui F. P.; Gonçalves, Renato; Fernandes, Mariana Advanced Sustainable Systems, Vol. 2, Issue 12 https://doi.org/10.1002/adsu.201800098	journal	October 2018

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