e-journal

Relationship between morphology and conductivity of block-copolymer based battery separators

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Abstract.
Nanoporous battery separators were made by blending a polystyrene-block-polyethylene-blockpolystyrene
copolymer (SES) and polystyrene (PS) homopolymers, casting films of the blend, and
selectively dissolving the homopolymer. The efficacy of the separators thus obtained was determined
by measurement of the ionic conductivity of separators soaked in 1 M lithium hexafluorophosphate in
ethylene carbonate/diethyl carbonate (1:1, v/v, Novolyte Technologies, Inc.), a standard lithium battery
electrolyte. We focus on the effect of chain length of the sacrificial homopolymer on separator morphology
and ion transport. In highly porous separators with a nominal pore volume fraction of 0.43,
conductivity peaked at α = 0.22, where values as high as 0.39 mS cm−1 were achieved (α is the molecular
weight of the PS homopolymer normalized by that of the PS block in the SES copolymer). Nitrogen
adsorption experiments and scanning electron microscopy were used to determine the underpinnings
of this observation. At α = 0.12, extremely small pores with low surface area are formed. Increasing α to
0.22 results in a film with well-connected nanoscale pores. A further increase in α to 2.02 results in films
with micron-sized pores that are not effective for ion transport.

Keywords: Battery separator; Nanoporous; Block copolymer blends; Morphology effect; Ionic conductivity

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Informasi Detail

Judul Seri

Journal of Membrane Science

No. Panggil

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Penerbit

New York : Elsevier B.V.., 2012

Deskripsi Fisik

Journal of Membrane Science 394– 395 (2012) 175– 183

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

394– 395 (2012)

Subjek

KIMIA MATERIAL

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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