Transport property and battery discharge characteristic studies on 1−x(0.75Agl∶0.25AgCl)∶ xAl2O3 composite electrolyte system
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Various experimental studies on a new fast Ag+ ion-conducting composite electrolyte system: (1−x) (0.75Agl∶0.25AgCl)∶xAl2O3 are reported. Undried Al2O3 particles of size <10 Μm were used. The conventional matrix material Agl has been replaced by a new mixed 0.75Agl∶0.25AgCl quenched and/or annealed host compound. Conductivity enhancements ∼10 from the annealed host and ∼3 times from the quenched host obtained for the composition 0.7(0.75Agl∶0.25AgCl)∶0.3Al2O3, can be explained on the basis of the space charge interface mechanism. Direct measurements of ionic mobility Μ as σ function of temperature together with the conductivity σ were carried out for the best composition. Subsequently, the mobile ion concentration n values were calculated from Μ and a data. The value of heat of ion transport q* obtained from the plot of thermoelectric power θ versus 1/T supports Rice and Roth's free ion theory for superionic conductors. Using the best composition as an electrolyte various solid state batteries were fabricated and studied at room temperature with different cathode preparations and load conditions.
KeywordsAl2O3 Ionic Mobility AgCl Thermoelectric Power Al2O3 Particle
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