Synthesis of nasicon solid electrolyte from tin tailing sand for sodium batteries applications

Abstract The use of sodium ion batteries in electrochemical applications is gaining increasing attention due to decreasing lithium reserves. One of the battery component is a solid electrolyte. NASICON electrolyte is a solid electrolyte with the composition Na 1+x Zr 2 Si x P 3-x O 12 which has a three-dimensional structure consist of various precursor. Silica is one of the NASICON precursors which can come from tin tailing sand. Therefore, this research aims to synthesis NASICON with a composition ratio (x = 1 and x = 1.5) derived from tin tailing sand by solid state route. Those NASICON is analysed its characteristic by XRD, SEM and EIS. NASICON in x=1 has fewer impurities and void than x=1.5. Moreover, NASICON with composition x=1 has higher conductivity than x=1.5 reaching 1.76 × 10 −4 S/cm. Therefore, x =1 ratio in NASICON better than x=1.5 and it can be candidate as a solid electrolyte for sodium batteries.