Abstract: A sheet metal file includes a main body composed of a sheet metal member that is flexible, and cutting edges raised by setting on a surface, on a first side, of the main body. The sheet metal file is allowed to smooth an object to be smoothed. The main body is an elastic member. The cutting edges are formed so that a driving depth with respect to the main body is in a range of 20 to 40% of a thickness of the main body. The sheet metal file is allowed to smooth an object to be smoothed with the surface of the main body on which the cutting edges are raised facing a curved surface of the object to be smoothed and with the main body bent along the curved surface.

Abstract: The invention provides a process for producing a sulfide-based solid electrolyte, the process having: a raw material composition preparation step for preparing a raw material composition containing at least sulfur (S), an adhesion inhibitor addition step for adding to the raw material composition an adhesion inhibitor that inhibits formation of adhered substances including the unreacted raw material composition, on the inner surface of a milling pot during mechanical milling, and a vitrification step for synthesizing sulfide-based glass by carrying out mechanical milling on the raw material composition to which the adhesion inhibitor has been added.

Abstract: The invention provides a process for producing a sulfide-based solid electrolyte, the process having: a raw material composition preparation step for preparing a raw material composition containing at least sulfur (S), an adhesion inhibitor addition step for adding to the raw material composition an adhesion inhibitor that inhibits formation of adhered substances including the unreacted raw material composition, on the inner surface of a milling pot during mechanical milling, and a vitrification step for synthesizing sulfide-based glass by carrying out mechanical milling on the raw material composition to which the adhesion inhibitor has been added.

Abstract: A manufacturing method for a solid electrolyte sheet includes applying slurry, which contains sulfide-based solid electrolyte powder, a sulfur-containing compound and a solvent, onto a base; and forming the slurry into a sheet.