The role of sintering temperature and dual metal substitutions (Al3+, Ti4+) in the development of NASICON-structured electrolyte
Document Type
Article
Publication Date
12-1-2021
Abstract
The aim of this study is to synthesize Li1+xAlxTixSn2-2x(PO4) sodium super ion conductor (NASICON) -based ceramic solid electrolyte and to study the effect of dual metal substitution on the electrical and structural properties of the electrolyte. The performance of the electrolyte is analyzed based on the sintering temperature (550 to 950 degrees C) as well as the composition. The trend of XRD results reveals the presence of impurities in the sample, and from Rietveld Refinement, the purest sample is achieved at a sintering temperature of 950 degrees C and when x = 0.6. The electrolytes obey Vegard ` s Law as the addition of Al3+ and Ti4+ provide linear relation with cell volume, which signifies a random distribution. The different composition has a different optimum sintering temperature at which the highest conductivity is achieved when the sample is sintered at 650 degrees C and x = 0.4. Field emission scanning electron microscope (FESEM) analysis showed that higher sintering temperature promotes the increment of grain boundaries and size. Based on energy dispersive X-ray spectroscopy (EDX) analysis, x = 0.4 produced the closest atomic percentage ratio to the theoretical value. Electrode polarization is found to be at maximum when x = 0.4, which is determined from dielectric analysis. The electrolytes follow non-Debye behavior as it shows a variety of relaxation times.
Keywords
NASICON-structured, Mechanical milling, Glass ceramic electrolyte, Impedance, Dielectric properties, Li1+xAlxTixSn2-2xP3O12
Divisions
physics,PHYSICS
Funders
Taif University, Taif, Saudi Arabia (TURST-2020/189)
Publication Title
Materials
Volume
14
Issue
23
Publisher
MDPI
Publisher Location
ST ALBAN-ANLAGE 66, CH-4052 BASEL, SWITZERLAND