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Electrical conductivity and dielectric relaxation behaviour of PEO/PVdF-based solid polymer blend electrolytes for zinc battery applications

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Abstract

A series of ion-conducting poly (ethylene oxide)/poly(vinylidene fluoride) [PEO/PVdF]-based solid polymer blend electrolytes derived from the addition of varying amounts of zinc trifluoromethane sulfonate (which is also known as zinc triflate), [Zn(CF3SO3)2] as dopant salt were synthesized in the form of films by solution-casting method. Accordingly, freshly prepared specimens of [90 wt% PEO/10 wt% PVdF + x wt% Zn(CF3SO3)2, where x = 3 to 18 wt% in steps of 3 wt%] were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and impedance analysis techniques. The room temperature XRD patterns tend to confirm the formation of an amorphous phase obtained by reducing the crystallinity of the host polymer blend matrix [90 wt% PEO/10 wt% PVdF] as a result of addition of 15 wt% zinc triflate salt. The relevant SEM images of this particular polymer blend electrolyte specimen exhibit a smooth and porous structure when compared to that of the host polymer blend [90 wt% PEO/10 wt% PVdF]. Remarkably, the highest ionic conductivity realized in the case of the typical polymer system [90 wt% PEO/10 wt% PVdF + 15 wt% Zn(CF3SO3)2] is found to be 2.5 × 10−5 S cm−1 at room temperature. The occurrence of ion dynamics and dielectric relaxation behaviour in the chosen system has been analysed in a detailed fashion at room temperature using frequency response impedance formalisms involving electric modulus and dielectric permittivity features.

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Acknowledgements

One of the authors (R.R.) greatly acknowledges the University of Madras for the award of University Research Fellowship (URF). The authors would also like to thank the National Centre for Nanoscience and Nanotechnology, University of Madras, for providing the necessary experimental facilities for SEM analysis.

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Authors and Affiliations

  1. Department of Energy, University of Madras, Guindy Campus, Chennai, 600025, India

    R. Rathika, O. Padmaraj & S. Austin Suthanthiraraj

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  1. R. Rathika
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  3. S. Austin Suthanthiraraj
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Correspondence to R. Rathika.

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Rathika, R., Padmaraj, O. & Suthanthiraraj, S.A. Electrical conductivity and dielectric relaxation behaviour of PEO/PVdF-based solid polymer blend electrolytes for zinc battery applications. Ionics 24, 243–255 (2018). https://doi.org/10.1007/s11581-017-2175-x

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