Effect of Sb-Ba codoping on the ionic conductivity of Li7La3Zr2O12 ceramic

Li6.925+xLa3-xBaxZr1.925Sb0.075O12 (0≤x≤0.08) ceramics were prepared by conventional solid-state reaction. The crystal structure, microstructure, ionic conductivity were characterized using XRD, SEM and Impedance analysis. XRD results showed that all compositions have a single cubic garnet-like structure. Li6.945La2.98Ba0.02Zr1.925Sb0.075O12 showed the highest conductivity and the lowest activation energy. The enhancement of its ionic conductivity could be explained by the enhanced densification and occupation on Li2 site.