SOLID-STATE ELECTROLYTE MATERIAL AND PREPARATION METHOD THEREOF, CATHODE ACTIVE MATERIAL, CATHODE PLATE, AND SOLID-STATE BATTERY

The present disclosure discloses provides a solid-state electrolyte material and a preparation method thereof, a cathode active material, a cathode plate, and a solid-state battery. The solid-state electrolyte has a NASICON crystal structure. In an X-ray diffraction pattern of the solid-state electrolyte material, the solid-state electrolyte material has a characteristic diffraction peak exhibit at a diffraction angle 2θ values 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°. A ratio of a peak intensity Iof the characteristic diffraction peak at a 2θ value of 14.5° to 14.8° to a peak intensity Iof the characteristic diffraction peak at a 2θ value of 22.5° to 22.8° satisfies: 1.5≤I/I≤3. Thus, an ionic conductivity and structural stability of the solid-state electrolyte are improved.