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Highly lithium ion conductive, Al2O3 decorated electrospun P(VDF-TrFE) membranes for Lithium ion battery separator

Abstract

Electrospun battery separators have drawn considerable attention due to their high porosity, surface area, and electrochemical performance. In this paper, a novel class of Al2O3 nanoparticles decorated Poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) membrane was fabricated by electrospinning technique. Both P(VDF-TrFE) and Al2O3 are well known for their excellent properties, like mechanical strength, piezoelectric nature, thermal stability etc, and the electrospun membrane is prepared by combining the excellence of these two materials. The physical properties of P(VDF-TrFE) and the influence of nanoparticles on the physical properties were evaluated by morphological, thermal, XRD and FT-IR analysis. SEM and TEM analysis shows that the nanoparticles increases the fiber diameter and are located on the surface as well as the bulk of the fiber. XRD studies reveal that the nanoparticles are localized at the inter-planar spacing of the polymer chain. Melting temperature of P(VDF-TrFE) is increased by the addition of Al2O3 nanoparticles, and all the prepared membranes exhibit superior thermal and dimensional stability than Celgard 2320 separator. The potential applications of the prepared membrane were explored as a lithium-ion battery separator by characterizing their wettability, electrolyte uptake, % porosity, ionic conductivity and charge-discharge performance. High porosity (>80%) of electrospun P(VDF-TrFE) and Lewis acid-base character of Al2O3 nanoparticles help to improve the ionic conductivity from 4.0 to 5.8 mS/cm at room temperature and electrolyte uptake from 280 to 375 %. Finally, 2032 type coin cells (Li/Separator/LiFePO4) were fabricated using P(VDF-TrFE) nanocomposites and the fabricated cell delivered a discharge capacity of 154 mAh/g, which is superior to Celgard 2320 separator (120 mAh/g). This work proves that Al2O3 incorporated electrospun P(VDF-TrFE) membrane is a promising candidate to act as lithium-ion battery separator.

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Publication details

The article was received on 19 Apr 2018, accepted on 08 Oct 2018 and first published on 10 Oct 2018


Article type: Paper
DOI: 10.1039/C8NJ01907J
Citation: New J. Chem., 2018, Accepted Manuscript
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    Highly lithium ion conductive, Al2O3 decorated electrospun P(VDF-TrFE) membranes for Lithium ion battery separator

    B. K, S. Suriyakumar, A. P. P, A. A S, N. Kalarikkal, A. M. Stephan, G. V. G, D. Rouxel and S. Thomas, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ01907J

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