AC CONDUCTIVITY STUDIES OF SILVER-BASED FAST-ION CONDUCTING GLASSY MATERIALS FOR SOLID-STATE BATTERIES

Glasses of various compositions of silver based fast ion conductors in the AgI-Ag2O-(XSeO2 + (1 - X)As2O5) (SSA) glassy system have been pre pared using the melt quenching method. In the present system, the dopa nt salt (AgI) and network modifier (Ag2O) contents were fixed, while t he contents of the network formers (XSeO2 + (1 - X) As2O5) have been v aried to prepare various compositions of the glassy compounds. The gla ssy nature of the compounds have been characterised by X-ray diffracti on. The electrical conductivity measurements have been carried out at 1 kHz as well as in the frequency range of 5 Hz-13 MHz and temperature range of 295-350 K. The measured impedance data were analysed using t he Boukamp equivalent circuit software and the de (bulk) as well as fr equency dependent conductivity were obtained for all the compositions of the SSA glassy compounds. Solid state batteries were fabricated usi ng the highest conducting SSA glass with different types of cathode ma terials. The open circuit voltage, polarisation and discharge characte ristics have been measured to estimate the life time of the batteries. (C) 1998 Elsevier Science S.A. All rights reserved.