SYNTHESIS AND CHARACTERIZATION OF SOLID STATE ELECTROLYTE FOR SODIUM-ION BATTERIES

Abstract

Rechargeable batteries have the potential to revolutionize sustainable energy storage, with applications in small portable devices and electric vehicles. The solid-state sodium-ion battery is expected as substitute to present commercial lithium-ion battery due to its rich sodium supplies, low cost, and high safety standards. Conventional electrolytes are often made up of an organic solvent and salts with strong conductivity, that ensures close contact with the electrodes and makes battery construction easier. Solid-state electrolytes are a crucial component of sodium-ion batteries require strong ionic conductivity while being operationally safe and simple to construct. In this study, Na3Zr2Si2PO12 (NZSP) electrolyte has been synthesised through solid-state route at different temperatures. X-ray diffraction characterization has been performed to confirm phase of NZSP. Strain and average crystallite size of NZSP has been calculated by Williamson-Hall plot using XRD peaks. Morphological examination has been done by scanning electron microscope (SEM) which revealed agglomeration and nonuniformity of particles. Pellet of bare NZSP electrolyte has been sintered, and its impedance spectroscopy characterization has performed in frequency range of 4 Hz - 8 MHz to evaluate ionic conductivity and dielectric properties. Furthermore, NZSP has been blended with polyethylene oxide (PEO) polymer to make composite electrolyte and its dielectric properties and ionic conductivity are studied.