The advance of gel polymer electrolyte (GPEs) based on conducting salt-polymer has been a subject ofconcern recently due to their significant applications. This work presents a study of dielectric propertiesof GPE based on polyvinyl alcohol (PVA) and potassium carbonate (K2CO3) (PVA-K2CO3) electrolytefor electrochemical applications. The electrolyte material was synthesized by mixing a conducting salt(K2CO3) with PVA in different proportions (from 10 - 50 wt. %) in order to study the effect of the salton the dielectric properties of the electrolyte. The synthesized GPE was characterized using X-raypowder diffraction (XRD) to study electrolyte’s crystal phase. Both complex permittivity and complexmodulus formalism (dielectric behaviour) of the electrolyte were analysed through electrochemicalimpedance spectroscopy (EIS). The characterization result shows that the peak intensity of the PVA issignificantly reduced with the increase of K2CO3 wt.%. which could be attributed to the decrease of PVAcrystallinity which can enlarge the amorphous region of the polymer due to the strong plasticizing effectof the salt. High values of complex permittivity (dielectric constant and dielectric loss) were observed atlow frequencies, which increased with increasing temperature, indicating an increase in conductivity.From the real part of electric modulus, the material is featured to be highly capacitive. Based on theasymmetrical peak shape of the imaginary part of electric modulus, the non-Debye type relaxation ispredicted. Straight-line graphs were observed from the frequency dependency of loss tangent (tan δ),showing no single relaxation process is present.
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