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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

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Abstract.
In a bid to develop a separator with improved thermal shrinkage that critically affects internal shortcircuit
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.

Keywords: Lithium-ion batteries; Separators; Thermal shrinkage; Electrochemical performance; Composite coating; layers; Phase inversion; Solvent–nonsolvent miscibility

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Membrane Science

No. Panggil

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Penerbit

New York : Elsevier B.V.., 2010

Deskripsi Fisik

Journal of Membrane Science 364 (2010) 177–182

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

364 (2010)

Subjek

KIMIA MATERIAL

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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