INVESTIGATION OF Li-Al-Si-O4 CERAMIC AS SOLID ELECTROLYTE SYNTHESIZED BY SOLID STATE METHOD

Abstract

The All Solid State Batteries (ASSBs) are recognized as the promising systems for storing energy with overcoming safety issues existing conventional liquid electrolyte-based Li/Na ion rechargeable batteries and also provide high energy density. The solid-state electrolytes (SSEs), are the most critical component of ASSBs. It leads to the future battery research and development. Since, the traditional Li-ion batteries have critical safety issues due to highly flammable liquid electrolytes or thermally instability of polymer electrolytes. Whereas, the ceramic based solid-state electrolyte shows high thermal stability, good ionic conductivity. LiAlSiO4(LASO) ceramics have been demonstrated to be a fast Li+ ion conductor and is cost effective as the element aluminum and silicon are cheaper and abundantly available on the earth, better electrochemical performance and low-cost material open up new possibilities for ceramic based solid-state batteries for commercialization. Herein, LASO ceramic solid electrolyte has been synthesized using the conventional solid-state reaction method. Thermogravimetric analysis (TGA) has been conducted to assess thermal stability of developed SSE. X-ray diffraction (XRD) is employed to confirm the formation of proper crystal structure. The average crystallite size of LASO has been estimated from the XRD pattern by Scherer’s formula and W-H plot using prominent XRD peaks. Scanning electron microscopy (SEM) characterization is performed for micro structural and surface morphological analysis of the material. Furthermore, Impedance spectroscopy (IS) has been performed to analyze the ionic conductivity and dielectric properties of SSEs.