Garnet-structured ceramic electrolyte material, preparation method and application therefor

The invention relates to a garnet-structured ceramic electrolyte material, a preparation method and an application therefor. The chemical composition of the garnet-structured ceramic electrolyte material is (1-z) Li (7-2x+2y) La3Zr (2-x) WxO (12+y)+ zA, wherein x is more than 0 and less than or equal to 1.00; y is more than 0 and less than or equal to 2.00; z is more than or equal to 0 and less than or equal to 10 wt.%; and A is any one of Li2O, MgO, CaO, SrO, BaO, Y2O3, B2O3, SiO2, WO3, CuO or Al2O3. According to the cubic garnet-structured lanthanum zirconate lithium crystal doped with W element provided by the invention, by doping W ion (+6 valence), which is higher than zirconium ions Zr4+ in valence, in the lanthanum zirconate lithium crystal to replace part of zirconium ions Zr4+ in crystal lattices, the number of lithium ions Li+ in the crystal is reduced, the vacancy of the lithium ions Li+ is increased, and the formation of an migration channel for the lithium ions Li+ is facilitated, so that the garnet-structured ceramic electrolyte material is higher in volume phase ionic conductivity.