Journal
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
Volume 51, Issue 23, Pages 1719-1726Publisher
WILEY
DOI: 10.1002/polb.23387
Keywords
battery separators; electrospinning; fibers; nanocomposites; nanoparticles; polyvinylidene fluoride; SiO2 nanoparticles
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Funding
- Advanced Transportation Energy Center
- ERC Program of the National Science Foundation [EEC-08212121]
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SiO2/polyvinylidene fluoride (PVDF) composite nanofiber-coated polypropylene (PP) nonwoven membranes were prepared by electrospinning of SiO2/PVDF dispersions onto both sides of PP nonwovens. The goal of this study was to combine the good mechanical strength of PP nonwoven with the excellent electrochemical properties of SiO2/PVDF composite nanofibers to obtain a new high-performance separator. It was found that the addition of SiO2 nanoparticles played an important role in improving the overall performance of these nanofiber-coated nonwoven membranes. Among the membranes with various SiO2 contents, 15% SiO2/PVDF composite nanofiber-coated PP nonwoven membranes provided the highest ionic conductivity of 2.6 x 10(-3) S cm(-1) after being immersed in a liquid electrolyte, 1 mol L-1 lithium hexafluorophosphate in ethylene carbonate, dimethyl carbonate and diethyl carbonate. Compared with pure PVDF nanofiber-coated PP nonwoven membranes, SiO2/PVDF composite fiber-coated PP nonwoven membranes had greater liquid electrolyte uptake, higher electrochemical oxidation limit, and lower interfacial resistance with lithium. SiO2/PVDF composite fiber-coated PP nonwoven membrane separators were assembled into lithium/lithium iron phosphate cells and demonstrated high cell capacities and good cycling performance at room temperature. (c) 2013 Wiley Periodicals, Inc.
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