Synthesis of Li₇La₃Zr₂O₁₂ Solid Electrolyte by Solid Phase Sintering Method

Li₇La₃Zr₂O₁₂ (LLZO) is a promising electrolyte material for all-solid-state battery due to its high ionic conductivity and good air stability with metallic lithium. In this article, Li₇La₃Zr₂O₁₂ electrolytes with excess lithium 4wt%, 6wt%, 8wt%, 10wt% were prepared by traditional two steps solid-phase sintering method. The influence of concentration of lithium and calcination temperature on the structure of Li₇La₃Zr₂O₁₂ were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) in detail. To improve the density of the sample, the granulation was applied. Scanning electron microscopy (SEM) results showed the granulation of Li₇La₃Zr₂O₁₂ power before pressing can significantly accelerate densification during the final high temperature, long duration sintering process. (paper)