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Thermomechanical analysis and durability of commercial micro-porous polymer Li-ion battery separators

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Abstract.
Static and dynamic thermomechanical analysis was performed with a dynamic mechanical analyzer
(DMA) to identify thermal and mechanical transitions for commercially available polymer separators
under mechanical loading. Clear transitions in deformation mode were observed at elevated temperatures.
These transitions identified the onset of separator “shutdown” which occurred at temperatures
below the polymer melting point. Mechanical loading direction was critical to the overall integrity of
the separator. Anisotropic separators (Celgard 2320, 2400 and 2500) were mechanically limited when
pulled in tensile in the transverse direction. The anisotropy of these separators is a result of the dry technique used to manufacture the micro-porous membranes. Separators prepared using the wet technique
(Entek Gold LP) behaved more uniformly, or biaxially, where all mechanical properties were nearly identical
within the separator plane. The information provided by the DMA can also be useful for predicting
the long-term durability of polymer separators in lithium-ion batteries exposed to electrolyte (solvent
and salt), thermal fluctuations and electrochemical cycling. Small losses in mechanical integrity were
observed for separators exposed to the various immersion environments over the 4-week immersion
time.

Keywords: Polymer separator; Lithium ion battery; Thermomechanical analysis; Durability; DMA

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Ketersediaan

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Informasi Detail

Judul Seri

Journal of Power Sources

No. Panggil

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Penerbit

New York : Elsevier B.V.., 2011

Deskripsi Fisik

Journal of Power Sources 196 (2011) 2905–2912

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

196 (2011)

Subjek

KIMIA MATERIAL

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

Lampiran Berkas

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