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Strain‐rate‐dependent mechanical properties of polypropylene separator for lithium‐ion batteries
Author(s) -
Moghim Mohammad Hadi,
Nahvi Bayani Ashkan,
Eqra Rahim
Publication year - 2020
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.5986
Subject(s) - ultimate tensile strength , separator (oil production) , materials science , polypropylene , composite material , strain rate , lithium ion battery , tensile testing , battery (electricity) , thermodynamics , physics , power (physics)
Abstract The mechanical integrity of battery separators is critical for battery safety and durability. A comprehensive study of strain‐rate‐dependent tensile and puncture properties of a polypropylene lithium‐ion battery separator is presented here with a new model. Due to anisotropy of the polymeric membrane, tensile testing was conducted for different directions. Results showed that tensile strength and elastic modulus were increased 1000% and 500%, respectively, for different directions. It was also demonstrated that tensile strength changed 10 to 25% with strain rate (1.67 × 10 −4 to 1.67 × 10 −1 s −1 ) for different directions. An equation was obtained for the first time for flow stress versus strain rate at varied tensile directions with respect to machine direction. Moreover, puncture testing was performed and it was shown that puncture strength was increased 140% with increasing strain rate from 0.25 to 250 mm min −1 . Two failure modes were also observed in puncture samples. Finally, Eyring's model was used to calculate activation enthalpy of the porous polypropylene separator. © 2020 Society of Chemical Industry