Solid electrolyte, preparation method thereof and all-solid-state battery

The invention relates to the technical field of batteries, in particular to a solid electrolyte, a preparation method thereof and an all-solid-state battery. The general chemical formula of the solid electrolyte is LiMbQcXdAeClq, M is selected from at least one of Ca, Mg and Zn, Q is selected from at least one of Ce, La, Al and Fe, and X is selected from at least one of Zr, Ti and Si; a is selected from at least one of P, As and Sb, 1 < = 2b + 3c + 4d + 5e < = 2, 0 < = b < = 1/8, 0 < = c < = 1/4, 0 < = d < = 1/6, 0 < = e < = 1/8, and 2.98 < = q < = 3.02. The solid electrolyte disclosed by the invention has excellent conductivity, and can ensure the capacity exertion of the positive electrode active material and the energy density of the whole battery; and the cycling stability of the all-solid-state lithium metal battery can be improved. 本发明涉及电池技术领域，具体而言，涉及一种固态电解质及其制备方法和全固态电池。本发明的固态电解质，化学通式为LiMbQcXdAeClq，其中，M选自Ca、Mg和Zn中至少一种，Q选自Ce、La、Al和Fe中的至少一种，X选自Zr、Ti和Si中的至少一种；A选自P、As和Sb中的至少一种，1≤2b+3c+4d+5e≤2，0≤b≤1/8，0≤c≤1/