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Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
Research Interests
  • Soft Materials for Energy Storage/ Conversion Systems

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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

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dc.contributor.author Jeong, Hyun-Seok ko
dc.contributor.author Choi, Eun-Sun ko
dc.contributor.author Lee, Sang-Young ko
dc.date.available 2014-09-18T02:27:42Z -
dc.date.created 2014-09-17 ko
dc.date.issued 2012-12 -
dc.identifier.citation ELECTROCHIMICA ACTA, v.86, no., pp.317 - 322 ko
dc.identifier.issn 0013-4686 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/6173 -
dc.identifier.uri http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84870690553 ko
dc.description.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. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher PERGAMON-ELSEVIER SCIENCE LTD ko
dc.subject Lithium-ion batteries ko
dc.subject Nonwoven composite separators ko
dc.subject Polyethylene terephthalate ko
dc.subject Polyvinylidene fluoride-hexafluoropropylene ko
dc.subject Silica ko
dc.title Composition ratio-dependent structural evolution of SiO2/poly(vinylidene fluoride-hexafluoropropylene)-coated poly(ethylene terephthalate) nonwoven composite separators for lithium-ion batteries ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84870690553 ko
dc.identifier.wosid 000313315600046 ko
dc.type.rims ART ko
dc.description.wostc 13 *
dc.description.scopustc 10 *
dc.date.tcdate 2015-05-06 *
dc.date.scptcdate 2014-09-17 *
dc.identifier.doi 10.1016/j.electacta.2012.03.126 ko
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