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Effect of SiO 2 content on performance of polypropylene separator for lithium‐ion batteries
Author(s) -
Liu Hongyu,
Xu Jun,
Guo Baohua,
He Xiangming
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41156
Subject(s) - polypropylene , materials science , polyvinylidene fluoride , separator (oil production) , composite material , composite number , electrolyte , coating , shrinkage , porosity , chemical engineering , polymer , chemistry , electrode , physics , engineering , thermodynamics
Composite separators are prepared by introducing SiO 2 nanoparticles on both sides of polypropylene separator with various SiO 2 contents through a dip‐coating process, where polyvinylidene fluoride‐hexafluoropropylene is used as binder. Coated layers have highly porous structure, which is quantitatively analyzed by air permeability. Compared to pristine separator, composite separators show significant lower Gurley value, reduced thermal shrinkage, higher liquid electrolyte uptake, better mechanical properties, and better cell performance such as discharge C ‐rate capability and cycle performance. The influence of SiO 2 content on these properties is also studied, and the best SiO 2 content is given. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 41156.