Transport and solid state battery characteristic studies of silver based super ion conducting glasses

Silverarsenotellurite (SAT), silverphosphotellurite (SPT) and silvervanadotellurite (SVT) quaternary glass systems were prepared with various formers compositions by a melt quenching method. Glass nature, glass transition temperature (Tg) and structure of the prepared glasses were identified respectively by X-ray diffraction (XRD), differential scanning calorimetric (DSC) and Fourier transform infrared (FT-IR) technique. Electrical conductivity studies were carried out by impedance measurement in the frequency range 40 Hz to 100 KHz at different temperatures for all three sets of AgI–Ag2O–[TeO2–M2O5] (M2O5 = As2O5, P2O5, V2O5) glasses. The high conducting compositions of SAT, SPT and SVT glass samples were fixed from the results of total conductivity (σt). Electronic conductivity (σe) studies were made on high conducting composition of each glass system by Wagnerʹs polarization method. Total current (it) is due to ion and electron. Electronic current (ie) due to electron were estimated through mobility studies. Ionic conductivity (σi) and ionic current (ii) were calculated respectively using the conductivity (σt and σe) and current (it and ie) results for the SAT, SPT and SVT glasses. Transport numbers due to ion (ti) and electron (te) were calculated using the conductivity and mobility results for each glass system. The high conducting composition of the SAT, SPT and SVT glasses were used as solid electrolytes with silver metal as an anode and iodine:graphite (I:C) as a cathode for the fabrication of solid state batteries (SSBs). All the fabricated batteries were characterized by measuring the open circuit voltage (OCV) and polarization properties and estimated the batteries performances.