Effects of temperatures to the electrical properties of Li1.6Al0.6Sn1.4P3O12 NASICON type solid electrolytes

Abstract

Li1.6Al0.6Sn1.4P3O12 solid electrolyte materials are prepared by mechanochemical milling method followed by heat treatment at five temperatures that are 550 °C, 650 °C, 750 °C, 850 °C and 950 °C for 8 h. X-ray diffraction is used to determine the crystallographic phases while scanning electron microscope and energy dispersive X-ray are used to study morphological properties and elemental compositions respectively. The conductivities of the pellets are determined using AC impedance spectroscopy. Substitution of Aluminium in LiSn2P3O12 system results in enhancement of room temperature ionic conductivity up to one orders of magnitude compared to the unsubstituted LiSn2P3O12 system. Furthermore, the sample with x = 0.4 shows higher ionic conductivity. This sample exhibits bulk conductivity of 10−6 S cm−1. This is attributed to increase in the number of conducting pathways due to an increase in crystallite homogeneity. This sample is also structurally stable toward temperature and thus suitable for thermal ele...