Method for producing lithium solid state battery

Abstract

A method for producing a lithium solid state battery having a solid electrolyte membrane with high Li ion conductivity, in which firm interface bonding is formed on both sides of the membrane, comprising steps of: a membrane-forming step of forming CSE1 not containing a binder, composed of a sulfide solid electrolyte material, on a cathode active material layer by an AD method and ASE1 not containing a binder, composed of a sulfide solid electrolyte material, on an anode active material layer by an AD method, and a pressing step of forming SE1 with the CSE1 and the ASE1 integrated by opposing and pressing the CSE1 and the ASE1, wherein the SE1 such that an interface between the CSE1 and the ASE1 disappeared is formed by improving denseness of the CSE1 and the ASE1 in the pressing step.

1 . An anode-side member for a lithium solid-state battery, the anode-side member comprising:
 an anode active material layer, and   a first solid electrolyte membrane not containing a binder, composed of a sulfide solid electrolyte material, and formed on the anode active material layer,   wherein a total membrane thickness of the first solid electrolyte membrane is within a range of 100 nm to 50 μm, and   wherein a porosity of a cross section of the first solid electrolyte membrane is within a range of 1% to 40%.   
     
     
         2 . The anode-side member for a lithium solid-state battery according to  claim 1 , wherein the anode-side member is used together with a cathode-side member having a smaller area than an area of the first solid electrolyte membrane. 
     
     
         3 . The anode-side member for a lithium solid-state battery according to  claim 1 , wherein a thickness of the anode active material layer is within a range of 0.1 μm to 500 μm. 
     
     
         4 . The anode-side member for a lithium solid-state battery according to  claim 1 , wherein the anode-side member comprises a second solid electrolyte membrane A not containing a binder, composed of a sulfide solid electrolyte material, and formed between the anode active material layer and the first solid electrolyte membrane, a thickness of the second solid electrolyte membrane A is within a range of 2.1 μm to 48.5 μm, and
 a porosity of a cross section of the second solid electrolyte membrane A is smaller than a porosity of a cross section of the first solid electrolyte membrane. 
 
     
     
         5 . The anode-side member for a lithium solid-state battery according to  claim 1 , wherein the anode-side member comprises a second solid electrolyte membrane B containing a binder, composed of a sulfide solid electrolyte material, and formed between the anode active material layer and the first solid electrolyte membrane,
 a thickness of the second solid electrolyte membrane B is within a range of 2.1 μm to 48.5 μm, and   a porosity of a cross section of the second solid electrolyte membrane B is smaller a porosity of a cross section of the first solid electrolyte membrane.   
     
     
         6 . The anode-side member for a lithium solid-state battery according to  claim 1 , wherein the anode-side member comprises:
 a second solid electrolyte membrane A not containing a binder, composed of a sulfide solid electrolyte material, and formed between the anode active material layer and the first solid electrolyte membrane; and   a second solid electrolyte membrane B containing a binder, composed of a sulfide solid electrolyte material, and formed between the anode active material layer and the first solid electrolyte membrane, wherein   a thickness of the second solid electrolyte membrane A is within a range of 2.1 μm to 48.5 μm, and a thickness of the second solid electrolyte membrane B is within a range of 2.1 μm to 48.5 μm; and   a porosity of a cross section of the second solid electrolyte membrane A is smaller than a porosity of a cross section of the first solid electrolyte membrane, and a porosity of a cross section of the second solid electrolyte membrane B is smaller than the porosity of a cross section of the first solid electrolyte membrane.