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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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Effect of microporous structure on thermal shrinkage and electrochemical performance of Al2O3/poly(vinylidene fluoride-hexafluoropropylene) composite separators for lithium-ion batteries

Cited 34 times inthomson ciCited 30 times inthomson ci
Title
Effect of microporous structure on thermal shrinkage and electrochemical performance of Al2O3/poly(vinylidene fluoride-hexafluoropropylene) composite separators for lithium-ion batteries
Author
Jeong, Hyun-SeokHong, Sung ChulLee, Sang-Young
Keywords
Composite coating layers; Electrochemical performance; Lithium-ion batteries; Phase inversion; Separators; Solvent-nonsolvent miscibility; Thermal shrinkage
Issue Date
201011
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF MEMBRANE SCIENCE, v.364, no.1-2, pp.177 - 182
Abstract
In a bid to develop a separator with improved thermal shrinkage that critically affects internal short-circuit failures of lithium-ion batteries, we demonstrate a new approach, which is based on introducing microporous composite coating layers onto both sides of a polyethylene (PE) separator. The composite coating layers consist of alumina (Al2O3) nanoparticles and polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) gel polymer electrolytes. The microporous structure of the composite coating layers is considered a crucial factor governing the thermal shrinkage and electrochemical performance of the separators. The microporous structure is determined by controlling the phase inversion, specifically the solvent-nonsolvent miscibility, in the coating solutions. To quantitatively identify the effect of the solvent-nonsolvent miscibility, three different nonsolvents are chosen in the decreasing order of solubility parameter (δ) difference against the solvent (acetone, δ=20MPa1/2), which are respectively water (δ=48MPa1/2), butyl alcohol (δ=29MPa1/2), and isopropyl alcohol (δ=24MPa1/2). The microporous structure of the composite coating layers becomes more developed with the increase of not only the nonsolvent content but also the solubility parameter difference between acetone and nonsolvent. Based on this observation, we investigate the influence of the morphological variations on the thermal shrinkage and electrochemical performance of the composite separators.
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DOI
http://dx.doi.org/10.1016/j.memsci.2010.08.012
ISSN
0376-7388
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