Structural, thermal, and transport studies on silver vanadium phosphate solid electrolyte

Silver-based quarternary fast ion conducting polycrystalline and glassy materials have been prepared by the open-air crucible melting method. A preliminary investigation revealed that the glassy electrolyte, when used in an electrochemical cell, has a high capacity of 15 mAH for the composition mole% 66.6 AgI22.2 Ag 2O-11.1 (0.8 V 2O 50.2 P 2O 5). In a further study, to establish the highest conducting composition, by varying the AgI mole%, it was found that the composition with mole% 70 AgI20 Ag 2O-10 (0.8 V 2O 50.2 P 2O 5) has an ionic conductivity of 8.2 × 10 −2 (ohm cm) −1 and an electronic conductivity of 2.6 × 10 −8 (ohm cm) −1 at 32°C. The infrared, far infrared, Raman, and EPR spectroscopic techniques were used to analyze and confirm the presence of ionic clusters, thus highlighting the structural units of the solid electrolyte. The existence of ionic clusters in the glass was assumed to be responsible for enhanced ionic conduction. Thermal and transport properties of the compound were studied to explore the effect of mixing two glass formers. The glass transition temperature ( T g) obtained from the DTA technique was well correlated with the obtained glass transition temperature from the log σT vs 10 3 T plot. The resistance-time and the resistance-frequency characteristics of the pellets were investigated to study the behavior of the material as an electrolyte in solid-state batteries.