Abstract
The polymer electrolyte system of methylcellulose (MC) doped with various sodium bromide (NaBr) salt concentrations is prepared in this study using the solution cast technique. FTIR and XRD were used to identify the structural changes in solid films. Sharp crystalline peaks appeared at the XRD pattern at 40 and 50 wt.% of NaBr salt. The electrical impedance spectroscopy (EIS) study illustrates that the loading of NaBr increases the electrolyte conductivity at room temperature. The DC conductivity of 6.71 × 10−6 S/cm is obtained for the highest conducting electrolyte. The EIS data are fitted with the electrical equivalent circuit (EEC) to determine the impedance parameters of each film. The EEC modeling helps determine the circuit elements, which is decisive from the engineering perspective. The DC conductivity tendency is further established by dielectric analysis. The EIS spectra analysis shows a decrease in bulk resistance, demonstrating free ion carriers and conductivity boost. The dielectric property and relaxation time confirmed the non-Debye behavior of the electrolyte system. An incomplete semicircle further confirms this behavior model in the Argand plot. The distribution of relaxation times is related to the presence of conducting ions in an amorphous structure. Dielectric properties are improved with the addition of NaBr salt. A high value of a dielectric constant is seen at the low frequency region.
Highlights
The hydroxyl band in pure MC and MCNAB electrolyte films is related to the wavenumber ranged from 3435 to 3447 cm−1, while the ether band emerged at 1047 and 1113 cm−1 [29], and the absorption bands shifted and intensity decreased in the electrolyte films
Polymer electrolytes of MC doped with NaBr were synthesized using the solution cast technique
FTIR and XRD approaches were used to categorize the structural changes in solid films
Summary
PEs consist of dissolved salts in polymer matrices with high molecular mass [7,8,9] These materials are better than the traditional liquid electrolytes. Ionic conduction in solid polymer electrolytes (SPEs) is not well understood This is because the property of ion transport relies on many factors, including salt concentration, degree of salt dissociation, degree of ion aggregation, the dielectric constant of host polymer, and polymer chains mobility [8,10,16,17,18,19]. Their study found that Na+ ions produce a higher ionic conductivity or at least a similar conductivity to Li+ ions in the same primary material This provided an outstanding opportunity to use Na+ ions rather than lithium in constructing a new battery generation, improving conductivity, and ensuring widespread supply. From the viewpoint of engineering, materials with a small value of Tanδ are more vital for electronics and devices application
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