Effect of calcining temperature on room temperature ionic conductivity of W, Y and Al co-doped Li₇La₃Zr₂O₁₂ solid electrolyte

Li_5.76La₃Zr_1.59W_0.35Y_0.06Al_0.2O₁₂ (W, Y, Al-LLZO) solid electrolyte was prepared by the solid-state reaction method. Effect of calcining temperature (T) on the crystal structure, morphology, relative density and shrinkage, total ionic conductivity of the prepared solid electrolyte were studied, respectively. Suitable T can stabilize cubic phase W, Y, Al-LLZO at room temperature, accelerate densification and improve the ionic conductivity respectively. The high total ionic conductivity of 2.31×10⁻⁴ S·cm⁻¹ at 25 ˚C is achieved in W, Y, Al-LLZO solid electrolyte calcined at 900 ˚C for 6 h. (paper)