Method for producing solid state battery

A method for producing a solid state battery comprising a laminate including a solid electrolyte layer, an active material layer and a current collector layer, said method comprising the steps of:

• (a) dispersing an active material powder in a solvent containing a binder and a plasticizer to obtain an active material slurry;
• (b) dispersing a solid electrolyte powder in a solvent containing a binder and a plasticizer to obtain a solid electrolyte slurry;
• (c) dispersing a current collector powder in a solvent containing a binder and a plasticizer to obtain a current collector slurry;
• (d) forming an active material green sheet and a solid electrolyte green sheet using said active material slurry and said solid electrolyte slurry, respectively;
• (e) laminating said solid electrolyte green sheet on one surface of said active material green sheet to form a first green sheet group, and forming a current collector green sheet layer on the other surface of said active material green sheet using said current collector slurry to form a second green sheet group;
• (f) heating said second green sheet group at not less than 200° C. and not greater than 400° C. in an oxidizing atmosphere;
• and
• (g) baking said second green sheet group having heated in said step (f) in a low oxygen atmosphere at a baking temperature higher than the heating temperature in said step (f) to obtain a laminate including a solid electrolyte layer, an active material layer and a current collector layer.