Summary:

The present invention belongs to the field of all-solid-state lithium-ion battery, and more specifically, relates to a Li6PS5Br solid-state electrolyte, its preparation and application. The chemical formula of this solid electrolyte is Li6–nxMxPS5Br, where n is 2, 3, or 4; M is at least one of Al, B, Si, Fe, Ge, and Sn, 0.05≤x≤0.3; the crystal structure of the solid electrolyte has a space group of cubic crystal forms, Br and S occupy the vertex and face center of the cube, tetrahedral PS4 occupies the midpoint of each side of the cube and the body center of the cube, and there are four independent S atoms inside the cube, each of which has 18 vacancies around each independent S atom, and part of the vacancies are occupied by Li+ or Mn+. The solid electrolyte material of the present invention has high ionic conductivity and is relatively stable relative to the lithium metal anode.

Link: http://epub.cnipa.gov.cn/patent/CN110931846A?8kt2YOWWXQBD=1667822130395