Solid electrolyte, method of preparing the same, and all-solid-state battery including the solid electrolyte

Abstract

The present invention relates to a sulfide-based solid electrolyte having excellent moisture stability and ionic conductivity, a method of preparing the same, and an all-solid-state battery including the sulfide-based solid electrolyte, wherein the present invention provides a solid electrolyte which includes a core portion including sulfide-based solid electrolyte particles; and a surface portion which is formed on the core portion and includes fluorine-doped sulfide-based solid electrolyte particles, wherein the surface portion includes a concentration gradient region in which a concentration of a fluorine (F) atom is decreased from a surface of the surface portion toward the core portion, a method of preparing the same, and an all-solid-state battery including the solid electrolyte.

Dependencies are inferred from the claim text.