Multilayered separator based on porous polyethylene layer, Al2O3 layer, and electro-spun PVdF nanofiber layer for lithium batteries

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With an aim to enhance the thermal stability and electrolyte wetting of a polyethylene porous separator, an Al2O3 nano-powder layer and an electro-spun PVdF nanofiber layer were successively formed on both sides of the polyethylene separator. The Al2O3 layer provides excellent thermal stability as indicated by thermal shrinkage of only 7.8 % in area at 180 A degrees C and absence of a meltdown up to 200 A degrees C. The electrolyte uptake of the multilayer separator was increased with the thickness of the nanofiber layer. As a result, discharge capacity, rate capability, and cycle life of the lithium ion batteries employing the PVdF nanofiber layers were improved, overcompensating for a loss of performance caused by the Al2O3 layer. Therefore, the multilayer approach is highly effective in improving both the performance and safety of lithium ion batteries.
Publisher
SPRINGER
Issue Date
2014-07
Language
English
Article Type
Article
Keywords

LI-ION BATTERIES; NONWOVEN COMPOSITE SEPARATORS; THERMAL-STABILITY; STRUCTURAL EVOLUTION; PHASE INVERSION; MEMBRANE; ENHANCEMENT; PERFORMANCE

Citation

JOURNAL OF SOLID STATE ELECTROCHEMISTRY, v.18, no.7, pp.1807 - 1814

ISSN
1432-8488
DOI
10.1007/s10008-014-2412-4
URI
http://hdl.handle.net/10203/189976
Appears in Collection
CBE-Journal Papers(저널논문)
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