Nano SiO2 particle formation and deposition on polypropylene separators for lithium-ion batteries

► The formation and deposition of SiO2 forms ceramic coating on polypropylene separators. ► SiO2 nanoparticles are formed through direct hydrolysis of tetraethyl orthosilicate. ► The deposition of SiO2 on PP separators was conducted in the same solution. ► The coated separators show significant impr...

Full description

Saved in:
Bibliographic Details
Published in:Journal of power sources 2012-05, Vol.206, p.325-333
Main Authors: Fu, Dong, Luan, Ben, Argue, Steve, Bureau, Martin N., Davidson, Isobel J.
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Lithium-ion batteries
Rate capability
Separators
Silica coating
Thermal shrinkage
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:► The formation and deposition of SiO2 forms ceramic coating on polypropylene separators. ► SiO2 nanoparticles are formed through direct hydrolysis of tetraethyl orthosilicate. ► The deposition of SiO2 on PP separators was conducted in the same solution. ► The coated separators show significant improvement in battery rate capability. The novelty of this work is the formation and deposition of SiO2, as opposed to deposition using commercially available SiO2 powder suspension in the solution, to form ceramic coating on polypropylene (PP) separators for lithium-ion battery. The formation of SiO2 nanoparticles with uniform particle size is accomplished through direct hydrolysis of tetraethyl orthosilicate (TEOS), while the deposition of the formed SiO2 on PP separators was conducted in the same solution containing polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP) as binders and acetone as the solvent. The effects of the ceramic coating on the surface morphology, tensile strength, contact angles, electrolyte uptake, thermal shrinkage of the PP separators and the cell performances such as battery rate capability and Coulombic efficiency were investigated. The coated separators show significant reduction in thermal shrinkage and improvement in tensile strength, contact angles, electrolyte uptake and battery performance as compared to the plain PP separator.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2011.10.130