Modified sulfide solid electrolyte and manufacturing method therefor

A method of manufacturing a modified sulfide solid electrolyte, the method comprising:

• mixing an organic halide and an organic solvent with a sulfide solid electrolyte having a BET specific surface area of 10 m2/g or more and containing a lithium atom, a sulfur atom, a phosphorus atom, and a halogen atom;
• and
• removing the organic solvent,
• wherein the organic halide is at least one compound selected from the group consisting of an organic halide 1 represented by formula (1), an organic halide 2 represented by formula (2), and an organic halide 3 represented by formula (3):
• wherein
• in the formula (1), X11 is a halogen atom selected from the group consisting of a chlorine atom, a bromine atom, and an iodine atom, each of X12 to X14 is independently a hydrogen atom, a halogen atom selected from the group consisting of a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, a monovalent aliphatic hydrocarbon group having a hydrogen atom optionally substituted with a halogen atom selected from the group consisting of a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom, or a monovalent alicyclic hydrocarbon group having a hydrogen atom optionally substituted with a halogen atom selected from the group consisting of a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom;
• in the formula (2), each of X21 to X26 is independently a hydrogen atom, a halogen atom, a monovalent aliphatic hydrocarbon group having a hydrogen atom optionally substituted with a halogen atom, or a monovalent alicyclic hydrocarbon group having a hydrogen atom optionally substituted with a halogen atom, with the proviso that at least one of X21 to X26 is a halogen atom or a group containing a halogen atom, the halogen atom for X21 is an atom selected from the group consisting of a chlorine atom, a bromine atom, and an iodine atom, and the halogen atom for X22 to X26 is independently an atom selected from the group consisting of a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom;
• and
• in the formula (3), each of X31 and X32 is independently a hydrogen atom, a halogen atom, a monovalent aliphatic hydrocarbon group having a hydrogen atom optionally substituted with a halogen atom, a monovalent alicyclic hydrocarbon group having a hydrogen atom optionally substituted with a halogen atom, or a group represented by formula (3a), where in the formula (3a), R31 is a single bond or a divalent aliphatic hydrocarbon group and R32 is a hydrogen atom, a halogen atom, or a monovalent aliphatic hydrocarbon group having a hydrogen atom optionally substituted with a halogen atom, with the proviso that at least one of X31 and X32 is a halogen atom or a group containing a halogen atom, the halogen atom for X31 is an atom selected from the group consisting of a chlorine atom, a bromine atom, and an iodine atom, and the halogen atom for X32 is an atom selected from the group consisting of a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom.