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Enhancement of the electrochemical properties with the effect of alkali metal systems on PEO/PVdF-HFP complex polymer electrolytes

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Abstract

Polymer blend electrolytes based on poly(ethylene oxide) (PEO) and poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) were prepared by using different lithium salts LiX (X = ClO4, BF4, CF3SO3, and N [CF3SO2]2) using solution casting technique. To confirm the structure and complexation of the electrolyte films, the prepared electrolytes were subjected to X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analysis. Alternating current (AC) impedance analysis was performed for all the electrolyte samples at various temperatures from 303 to 343 K. The result suggests that among the various lithium salts, LiN[CF3SO2]2-based electrolytes exhibited the highest ionic conductivity at 8.20 × 10−4 S/cm. The linear variation of the ionic conductivity of the polymer electrolytes with increasing temperature suggests the Arrhenius-type thermally activated process. Activation energies were found to decrease when doping with lithium imide salt. The dielectric behavior has been analyzed using dielectric permittivity (ε*), electric modulus (M*), and dissipation factor (tanδ) of the samples. Cyclic voltammetry has been performed for the electrolyte films to study their cyclability and reversibility. Thermogravimetric and differential thermal analysis (TG/DTA) was used to ascertain the thermal stability of the electrolytes, and the porous nature of the electrolytes was identified using scanning electron microscopy via ion hopping conduction. Surface morphology of the sample having maximum conductivity was studied by an atomic force microscope (AFM).

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Acknowledgments

The author P. Pradeepa gratefully acknowledges the UGC-BSR, New Delhi, India, for the financial support to carry out this work.

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Authors and Affiliations

  1. School of Physics, Alagappa University, Karaikudi, Tamil Nadu, 630 004, India

    Pradeepa Prabakaran & Ramesh Prabhu Manimuthu

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  1. Pradeepa Prabakaran
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  2. Ramesh Prabhu Manimuthu
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Correspondence to Ramesh Prabhu Manimuthu.

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Prabakaran, P., Manimuthu, R.P. Enhancement of the electrochemical properties with the effect of alkali metal systems on PEO/PVdF-HFP complex polymer electrolytes. Ionics 22, 827–839 (2016). https://doi.org/10.1007/s11581-015-1618-5

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  • DOI: https://doi.org/10.1007/s11581-015-1618-5

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