Method for producing sulfide solid-state battery, and sulfide solid-state battery

A method for producing a sulfide solid-state battery that includes a cathode, an anode, and a solid electrolyte layer provided between the cathode and the anode, the method comprising:

• layering an anode mixture (a) over a surface of an anode current collector, to form an anode mixture layer A1, the anode mixture (a) containing a polyamic acid, and silicon-based active material but not containing a sulfide solid electrolyte;
• heating the anode mixture layer A1 to imidize the polyamic acid, to make an anode mixture layer A2 which contains a polyimide and in which a void is present;
• layering a sulfide solid electrolyte over a surface of the anode mixture layer A2 on an opposite side of the anode current collector;
• pressing the anode mixture layer A2, over which the sulfide solid electrolyte is layered, to insert the sulfide solid electrolyte into the void in the anode mixture layer A2, to make an anode mixture layer A3 that contains the sulfide solid electrolyte;
• and
• layering an anode mixture (b) over a surface of the anode mixture layer A3, to form an anode mixture layer B, the anode mixture (b) containing carbonaceous active material and binder.