Bulg. J. Phys. vol.50 no.3 (2023), pp. 207-224

Na-ion Transportation, Dielectric Relaxation and Electric Modulus Behavior of (PEO/PVDF) Based Nanocomposite Polymer Electrolyte

Kiran Kumar Ganta1,2, Vijaya Kumar Katrapally2, Venkata Ramana Jeedi1
1Department of Physics, B V Raju Institute of Technology, Narsapur, Medak, Telangana 502313, India
2JNTUH University College of Engineering Rajanna Sircilla, Agraharam, Rajanna Sircilla (District), Telangana 505302, India
Abstract. Nanocomposite Polymer Electrolyte (NCPE) films were prepared with a blend of two polymers: poly ethylene oxide (80 wt% PEO) and poly vinylidene fluoride (20 wt% PVDF) complexed with a salt, sodium perchlorate (7.5 wt% NaClO4) and a nano-filler, iron oxide (x wt% Fe2O3) (i.e., (0.8PEO/0.2PVDF) + 7.5 wt% NaClO4 + x wt% Fe2O3. The complexation and surface morphology of prepared NCPE films have been investigated using XRD and SEM techniques, respectively. Electrochemical Impedance Spectroscopy (EIS) studies were done in the frequency range from 10 Hz to 4 MHz to understand the Na-ion transportation, dielectric relaxation and electric modulus of the prepared NCPE films. The impact of Fe2O3 nano-filler concentration (Fe2O3 wt%) on the Na-ion transportation, dielectric relaxation and ionic conductivity has been studied. The AC conductivity of all the prepared NCPE films at high frequency followed Jonscher's power law. The DC ionic conductivity values calculated from the bulk resistance (Rb) of the NCPE films were consistent with the values calculated using Jonscher's power law. The temperaturedependent ionic conductivity followed the Arrhenius rule between 303 and 333 K. The highest ionic conductivity of 1.13×10-4 S/cm was achieved at ambient temperature for the NCPE-16 film (0.8PEO/0.2PVDF) + 7.5 wt% NaClO4 + 16 wt% Fe2O3, and it is due to lowest crystallinity of NCPE-16 film. The ionic and electronic transport numbers of all the NCPE films were calculated using Wagner's polarization technique.

doi: https://doi.org/10.55318/bgjp.2023.50.3.207

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