Journal
ELECTROCHIMICA ACTA
Volume 56, Issue 14, Pages 5201-5204Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2011.03.040
Keywords
Lithium-ion batteries; Composite non-woven separators; Polyvinylidene fluoride-hexafluoropropylene; Polyethylene terephthalate; Microporous Structure; Cell performance
Categories
Funding
- Korean Government (MEST) [NRF-2009-C1AAA001-2009-0093307]
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We demonstrate potential application of a new composite non-woven separator, which is comprised of a phase inversion-controlled, microporous polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) gel polymer electrolyte and a polyethylene terephthalate (PET) non-woven support, to high-voltage and high-power lithium-ion batteries. In comparison to a commercialized polyethylene (PE) separator, the composite non-woven separator exhibits distinct improvements in microporous structure and liquid electrolyte wettability. Based on the understanding of the composite non-woven separator, cell performances of the separator at challenging charge/discharge conditions are investigated and discussed in terms of ion transport of the separator and AC impedance of the cell. The aforementioned advantageous features of the composite non-woven separator play a key role in providing facile ion transport and suppressing growth of cell impedance during cycling, which in turn contribute to superior cell performances at harsh charge/discharge conditions such as high voltages and high current densities. (C) 2011 Elsevier Ltd. All rights reserved.
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