Method for producing lithium secondary battery thick film and method for producing lithium secondary battery by using electrostatic slurry spraying of slurry containing sulfide-based solid electrolyte

A method of manufacturing a lithium secondary battery, the method comprising:

• electrostatically spraying a first composite electrode slurry including a powder of a sulfide-based solid electrolyte, a powder of a first active material, and a powder of a conductive material to deposit a first lithium secondary battery composite electrode thick film;
• electrostatically spraying a solid electrolyte slurry including a powder of a sulfide-based solid electrolyte on the first lithium secondary battery composite electrode thick film to deposit a lithium secondary battery solid electrolyte thick film;
• and
• electrostatically spraying a second composite electrode slurry including a powder of a sulfide-based solid electrolyte, a powder of a second active material, and a powder of a conductive material on the lithium secondary battery solid electrolyte thick film to deposit a second lithium secondary battery composite electrode thick film,
• wherein one of the first active material and the second active material is a positive active material and the other is a negative active material, and
• the first composite electrode slurry, the solid electrolyte slurry, and the second composite electrode slurry each include at least one solvent selected from dichloroethane and dichlorobenzene and are electrostatically sprayed in a cone-jet mode in a nitrogen atmosphere.