Influence of plasticizer on structural, electrical, and electrochemical properties of polyvinyl alcohol-chicken gelatin solid polymer electrolytes
摘要
Solid biodegradable polymer electrolytes (SBPEs) appear to be the most favored option for safe and highly efficient energy storage systems. This study aims to fabricate and characterize plasticized SBPEs based on polyvinyl alcohol and chicken gelatin (PVA-CG) polymers employing a solution casting methodology. The ionic source is sodium nitrate (NaNO3) salt, and glycerol is used as a plasticizer. Fourier-transformed infrared (FTIR) spectroscopy and X-ray diffraction (XRD) techniques were conducted to evaluate structural characteristics. The complex formation within the SBPE system was identified through FTIR analysis, suggesting a favorable interaction between the electrolyte components. The deconvoluted XRD spectra provided information about the degree of crystallinity of the films. The results from the XRD analysis indicated that an electrolyte with the highest amorphousness has the maximum ionic conductivity. Electrochemical impedance spectroscopy (EIS) was conducted to evaluate the electrical properties at room temperature. From the EIS, ionic conductivity improved with the addition of plasticizer, and the highest ionic conductivity of 8.22 × 10−4 S/cm was obtained for the maximum glycerol content. The overall conductivity is mostly attributed to ions rather than electrons. Both the dielectric constant and dielectric loss were higher at lower frequencies. The investigations of dielectric relaxation have shown that the emergence of peaks confirmed the non-Debye relaxation type.