Multilayered separator based on porous polyethylene layer,Al2O3 layer,and electro-spun PVdF nanofiber layer for lithium batteries |
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Authors: | Min-Young An Hee-Tak Kim Duck-Rye Chang |
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Affiliation: | 1. Gwangju Research Center, Korea Institute of Industrial Technology, Gwangjusi, 500-480, Republic of Korea 2. Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejon, 305-701, Republic of Korea
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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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