Transition metal ion and Dy < 3 + > co-doped solid electrolyte ceramic material and preparation method thereof

The invention discloses a transition metal ion and Dy < 3 + > co-doped Na-beta (beta '')-Al2O3 solid electrolyte ceramic material, which is characterized in that a transition metal ion M and Dy < 3 + > are introduced on the basis of a chemical formula INa < 1.67 > Li < 0.33 > Al < 10.67 > O17; m is one of Mn < 2 + >, Co < 2 + >, Ni < 2 + >, Zn < 2 + > and Cu < 2 + >, and the introduction amount of M is that the molar ratio of Al < 3 + > to M is (50-150): 1; the introduction amount of Dy < 3 + > is that the molar ratio of Al < 3 + > to Dy < 3 + > is (200-400): 1; m ions and Dy < 3 + > are doped into ceramic crystal lattices to replace Al < 3 + >, and Dy < 3 + > also exists in the form of a DyAlO3 crystal phase. In addition, the invention also discloses a preparation method of the solid electrolyte ceramic material. On the basis of introducing Li < + > to stabilize a beta ''-Al2O3 phase structure, transition metal ions M are doped so as to be beneficial to reducing the sintering temperature and reducing Na < +