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8163077 
Journal Article 
Effect of NaCLO4 concentration on the ionic conductivity and dielectric properties of sodium ion-conducting PEO/PVDF solid polymer electrolytes for energy storage applications 
Ganta, KK; Jeedi, VR; Kumar, KV; Narsaiah, EL 
2020 
10 
9 
5589-5606 
English 
Solid Polymer Electrolyte (SPE) films based on a mixture of two polymers poly (ethylene oxide) (PEO) and poly (vinylidene fluoride) (PVDF) complexed with sodium perchlorate (NaClO4) salt (i.e., (80PEO/20PVDF) + xwt%NaClO4; where x = 2.5, 5, 7.5, and 10) were synthesized and characterized as potential candidates for battery (energy storage) applications. Effect of NaClO4 salt concentration on the structural, ionic conductivity, and dielectric relaxation has been studied. Electrochemical Impedance Spectroscopy (EIS) has been utilized between the frequencies 100 Hz and 4 MHz to investigate conductivity spectra, impedance spectra, dielectric spectra, and electrical modulus spectra. The AC conductivity of the SPE films at high frequencies obeys the Jonscher’s power law. In two different methods, the Direct Current ionic conductivity was found. In the first method, it was calculated by fitting the AC conductivity spectra to the best fit of Joncher’s power law. In the second method, it was calculated from the bulk-resistance (Rb) of the SPE film. The DC ionic conductivity values computed by the two methods are almost consistent. The DC ionic conductivity enhances with salt concentration (wt%) up to 7.5wt% and then the ionic conductivity decreases with an enhancement in salt wt%. The ionic conductivity that depends on temperature follows the Arrhenius rule between the temperatures 303 K and 333 K. The maximum ionic conductivity 5.94x10-5 S/cm at 303 K was obtained for blend matrix 80PEO/20PVDF with 7.5wt%NaClO4. Analysis of dielectric constant and electric modulus shows the strong coupling between polymer and ion segmental motion. © 2020 Alpha Publishers. All rights reserved. 
Electrochemical Impedance Spectroscopy; Ionic conductivity; PEO/PVDF blend