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

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Abstract

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 °C and absence of a meltdown up to 200 °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.

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Authors and Affiliations

  1. Gwangju Research Center, Korea Institute of Industrial Technology, Gwangjusi, 500-480, Republic of Korea

    Min-Young An & Duck-Rye Chang

  2. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejon, 305-701, Republic of Korea

    Hee-Tak Kim

Authors
  1. Min-Young An
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  2. Hee-Tak Kim
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  3. Duck-Rye Chang
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Correspondence to Hee-Tak Kim or Duck-Rye Chang.

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An, MY., Kim, HT. & Chang, DR. Multilayered separator based on porous polyethylene layer, Al2O3 layer, and electro-spun PVdF nanofiber layer for lithium batteries. J Solid State Electrochem 18, 1807–1814 (2014). https://doi.org/10.1007/s10008-014-2412-4

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  • DOI: https://doi.org/10.1007/s10008-014-2412-4

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