Intermediate-temperature conductivity of Al~(3+)-doped Na_(0.5)Bi_(0.49)TiO_(3-δ) lead-free oxide-ion-conductor solid electrolytes

摘要

In this work, to increase the intermediate-temperature oxide-ion conductivity of Na0.5Bi0.49TiO3-delta lead-free oxide-ion-conductor solid electrolytes, Al3+ with smaller ion radius is introduced to replace Ti4+ at the B site. The experimental results show that Al3+ doping of an appropriate amount results in an obvious increase in the oxide-ion conductivity of Na0.5Bi0.49TiO3-delta solid electrolyte. However, when the doping concentration exceeds 4 mol%, the oxide-ion conductivity decreases. The conductivity is highest for solid electrolyte doped with 4 mol% Al3+. At a measurement temperature of 600 degrees C in air, the conductivity is as high as 2.71 x 10(-3) S/cm, which is more advantageous than other intermediate-temperature solid electrolytes at the application of electrochemical devices.