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

Hyun Seok Jeong; Sung Chul Hong; Sang Young Lee

doi:10.1016/j.memsci.2010.08.012

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

Hyun Seok Jeong, Sung Chul Hong, Sang Young Lee

Department of Chemical and Biomolecular Engineering

Research output: Contribution to journal › Article › peer-review

169 Citations (Scopus)

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=20MPa^1/2), which are respectively water (δ=48MPa^1/2), butyl alcohol (δ=29MPa^1/2), and isopropyl alcohol (δ=24MPa^1/2). 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.

Original language	English
Pages (from-to)	177-182
Number of pages	6
Journal	Journal of Membrane Science
Volume	364
Issue number	1-2
DOIs	https://doi.org/10.1016/j.memsci.2010.08.012
Publication status	Published - 2010 Nov 15

Bibliographical note

Funding Information:
This work was supported by National Research Foundation of Korea Grant funded by the Korean Government ( 2009-0070967 ). We are grateful to Dr. E.K. Shim and Mr. J.S. Kim at Technosemi Chem, Mr. S.H. Kim at Arkema Korea, and Mr. B.J. Choi at ExxonMobil Korea for their supply of samples. We also express deep appreciation to Dr. K.J. Kim and Mr. Y.N. Cho at KETI for their kind assistance in the characterization of electrochemical performance.

All Science Journal Classification (ASJC) codes

Biochemistry
Materials Science(all)
Physical and Theoretical Chemistry
Filtration and Separation

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1016/j.memsci.2010.08.012

Cite this

@article{d4dfec451d1f470cb402b364514d143a,

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

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.",

author = "Jeong, {Hyun Seok} and Hong, {Sung Chul} and Lee, {Sang Young}",

note = "Funding Information: This work was supported by National Research Foundation of Korea Grant funded by the Korean Government ( 2009-0070967 ). We are grateful to Dr. E.K. Shim and Mr. J.S. Kim at Technosemi Chem, Mr. S.H. Kim at Arkema Korea, and Mr. B.J. Choi at ExxonMobil Korea for their supply of samples. We also express deep appreciation to Dr. K.J. Kim and Mr. Y.N. Cho at KETI for their kind assistance in the characterization of electrochemical performance.",

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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. / Jeong, Hyun Seok; Hong, Sung Chul; Lee, Sang Young.

In: Journal of Membrane Science, Vol. 364, No. 1-2, 15.11.2010, p. 177-182.

Research output: Contribution to journal › Article › peer-review

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T1 - Effect of microporous structure on thermal shrinkage and electrochemical performance of Al2O3/poly(vinylidene fluoride-hexafluoropropylene) composite separators for lithium-ion batteries

AU - Jeong, Hyun Seok

AU - Hong, Sung Chul

AU - Lee, Sang Young

N1 - Funding Information: This work was supported by National Research Foundation of Korea Grant funded by the Korean Government ( 2009-0070967 ). We are grateful to Dr. E.K. Shim and Mr. J.S. Kim at Technosemi Chem, Mr. S.H. Kim at Arkema Korea, and Mr. B.J. Choi at ExxonMobil Korea for their supply of samples. We also express deep appreciation to Dr. K.J. Kim and Mr. Y.N. Cho at KETI for their kind assistance in the characterization of electrochemical performance.

PY - 2010/11/15

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N2 - 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.

AB - 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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