Solid-state electrolyte material and preparation method thereof, cathode active material, cathode plate, and solid-state battery

A solid-state electrolyte material, comprising:

• LixM1yM2zM3u(PO4)w1(P2O7)w2(ROv)w3, where:
• M1 comprises at least one of Mg, Na, or K;
• M2 comprises at least one of Al, Ga, In, Y, or Sc;
• M3 comprises at least one of Ti, Zr, or Ge;
• R comprises at least one of Mo, W, Si, Cl, Br, S, Sb, Sn, F, or P;
• and
• 0<x≤5, 0≤y≤0.5, 0≤z≤1, 0≤u≤9, 0≤v≤4, 1≤w1≤3, 0<w2≤2.3, 0<w3≤3, and w1+w2+w3=3;
• wherein the solid-state electrolyte material has a Na Super Ionic Conductor, NASICON, crystal structure, and
• wherein in an X-ray diffraction pattern of the solid-state electrolyte material, the solid-state electrolyte material has a characteristic diffraction peak at a diffraction angle 2θ value of 14.5° to 14.8°, a characteristic diffraction peak at a diffraction angle 2θ value of 19.5° to 19.7°, and a characteristic diffraction peak at a diffraction angle 2θ value of 22.5° to 22.8°, wherein a ratio of a peak intensity I1 of the characteristic diffraction peak at the 2θ value of 14.5° to 14.8° to a peak intensity I2 of the characteristic diffraction peak at the 2θ value of 22.5° to 22.8° satisfies:
• 1.5≤I2/I1≤3.