Abstract
In this work, to increase the intermediate-temperature oxide-ion conductivity of Na0.5Bi0.49TiO3−δ 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−δ 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 °C in air, the conductivity is as high as 2.71 × 10−3 S/cm, which is more advantageous than other intermediate-temperature solid electrolytes at the application of electrochemical devices.
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