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Lee, Sang-Young
Energy Soft-Materials Lab.
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Composition ratio-dependent structural evolution of SiO2/poly(vinylidene fluoride-hexafluoropropylene)-coated poly(ethylene terephthalate) nonwoven composite separators for lithium-ion batteries

Author(s)
Jeong, Hyun-SeokChoi, Eun-SunLee, Sang-Young
Issued Date
2012-12
DOI
10.1016/j.electacta.2012.03.126
URI
https://scholarworks.unist.ac.kr/handle/201301/6173
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84870690553
Citation
ELECTROCHIMICA ACTA, v.86, pp.317 - 322
Abstract
We demonstrate a facile approach for the fabrication of new silica (SiO2) nanoparticles/polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP)-coated polyethylene terephthalate (PET) nonwoven composite separators for use in lithium-ion batteries. By varying the SiO2/PVdF-HFP composition ratio, we can fine-tune the porous structure of the composite separators. At a low SiO2/PVdF-HFP ratio, a nonporous structure featuring the PVdF-HFP matrix and SiO2 domains is obtained. By contrast, an unusual porous structure (i.e., highly-percolated interstitial voids formed between close-packed SiO2 nanoparticles) is developed at a high SiO2/PVdF-HFP ratio, where PVdF-HFP serves as a binder to interconnect SiO2 powders. This drastic change in the morphology of the composite separators is further confirmed by observing their air permeability and ionic conductivity. Meanwhile, a PET nonwoven is employed as a mechanical substrate to suppress thermal shrinkage of the composite separators. On the basis of morphological characterization, the effects of the composition ratio-dependent structural evolution of the composite separators on the electrochemical performance of cells are investigated. Notably, the composite separator fabricated from a composition ratio of SiO2/PVdF-HFP = 90/10 (wt%/wt%) provides superior cell performance owing to a well-tailored microporous structure, as compared to a commercialized polyethylene (PE) separator.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0013-4686
Keyword (Author)
Lithium-ion batteriesNonwoven composite separatorsSilicaPolyvinylidene fluoride-hexafluoropropylenePolyethylene terephthalate
Keyword
POLYMER ELECTROLYTESGEL POLYMERMEMBRANEELECTROSPUNLICOO2

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