Synthesis, Characterization and Electrical Properties of ZrO2 Dispersed PEO-KNO3 Nanocomposite Polymer Electrolyte Systems

Abstract: Polymer electrolytes have sparked widespread interest due to their potential applications in solid-state batteries and electrochemical devices. In this study, nanocomposite polymer electrolytes based on polyethylene oxide (PEO) and potassium nitrate (KNO3) were produced using variable quantities of zirconium dioxide (ZrO2) as an inorganic filler. The structural, morphological, and electrical properties were carefully examined. X-ray diffraction (XRD) indicated a decrease in crystallinity with increased ZrO2 loading, indicating expanded amorphous regions conducive to ionic transport. Scanning electron microscopy (SEM) demonstrated a uniform distribution of ZrO2 nanoparticles throughout the PEO-KNO3 matrix. Impedance spectroscopy revealed a considerable improvement in ionic conductivity at the appropriate ZrO2 concentration. The findings emphasize the complementing role of ceramic fillers in boosting the performance of polymer electrolytes, making the system an attractive choice for solid-state electrochemical applications. Keywords: PEO–KN03, ZrO2 nanoparticles, Ionic conductivity, Dielectric properties, Electric modulus, XRD, SEM, FTIR.