Preparation and characterization of ZnO-doped and Li_2O-stabilized Na-β″-Al_2O_3 solid electrolyte via a solid-state reaction method

摘要

In this paper, Na-β″-Al_2O_3 is prepared using a conventional solid-state method and cost-effective burying and sintering processes with aluminum oxide and sodium carbonate as the raw materials. Lithium carbonate is added as the stabilizer, and the effect of ZnO doping on the material properties is investigated. The sample is characterized using an x-ray diffraction, a field-emission scanning electron microscope, an energy-dispersive x-ray spectroscope, and a raman spectroscope. Moreover, the density of the sample is measured using the Archimedean method, and the ionic conductivity is detected using the EIS method. Results suggest that no new phases are generated after ZnO doping and that the contents of Na~+ vary according to the doping amount. When the ZnO is 1 wt%, the density of the sample is 3.190 g/cm~3; moreover, the conductivity at 300 °C increases from 0.027 (doping-free) to 0.057 S/cm, and the conductance activation energy is 0.220 eV.