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Journal of Materials Science

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01-10-2014

Preparation and performance of silica/polypropylene composite separator for lithium-ion batteries

Authors: Hongyu Liu, Jun Xu, Baohua Guo, Xiangming He

Published in: Journal of Materials Science | Issue 20/2014

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Abstract

In an effort to improve thermal stability and mechanical properties of porous polypropylene (PP) separators for lithium-ion battery, SiO₂/PP/SiO₂ composite separators were prepared by introducing SiO₂ layer on both sides of PP separator through a dip-coating process, with polyvinylidene fluoride–hexafluoropropylene (PVDF–HFP) as binder. SiO₂ nanoparticles are evenly distributed and closely packed in the coated layer, which features a porous honeycomb structure. This unique porous structure was quantitatively analyzed by Gurley value, and it can retain liquid electrolyte, leading to higher electrolyte uptake and ionic conductivity of the composite separator. The introduction of SiO₂-coated layers can not only suppress thermal shrinkage but also improve mechanical properties of the composite separator. C-rate capability and cycle performance of composite separator were also investigated, and compared to those of pristine PP separator.

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Title: Preparation and performance of silica/polypropylene composite separator for lithium-ion batteries
Authors: Hongyu Liu
Jun Xu
Baohua Guo
Xiangming He
Publication date: 01-10-2014
Publisher: Springer US
Published in: Journal of Materials Science / Issue 20/2014
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI: https://doi.org/10.1007/s10853-014-8401-2

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