Method and apparatus for producing all-solid-state battery
Provided is a method for producing an all-solid-state battery, which is capable of preventing the occurrence of a short circuit or a charge abnormality due to the formation of a dendrite even in cases where the pressing force is decreased. In the method for producing an all-solid-state battery, a solid electrolyte layer is arranged between a positive electrode layer and a negative electrode layer and current collectors are connected to the positive electrode layer and the negative electrode layer, respectively. This method for producing an all-solid-state battery is characterized by comprising: a step for forming at least one powder film for constituting the positive electrode layer, the negative electrode layer and/or the solid electrolyte layer, and a step for pressing a surface of the powder film by a pressing body consisting of an elastic body.
1. A production method of an all-solid-state battery wherein a solid electrolyte layer is arranged between a positive electrode layer and a negative electrode layer and current collectors are arranged on the positive electrode layer and the negative electrode layer respectively, the method comprising:
forming a first powder film for constituting one of the positive electrode layer and the negative electrode layer;
pressing a surface of the first powder film by a first elastic pressing body to form a first layer, the first layer being one of the positive electrode layer and the negative electrode layer;
subsequently forming, on the first layer, a second powder film for constituting the solid electrolyte layer, the second powder film being different from the first powder film; and
pressing a surface of the second powder film by a second elastic pressing body to form a second layer, the second layer being the solid electrolyte layer, the second elastic pressing body being either the same as or different from the first elastic pressing body.
2. The production method of the all-solid-state battery according to claim 1 , wherein the first elastic pressing body includes an elastic body,
wherein a surface sheet having a lower stretchability than the elastic body is provided on a surface of the first elastic pressing body, the surface sheet of the first elastic pressing body brought into contact with the first powder film during the step of pressing of the surface of the first powder film, and
wherein, in the step of pressing of the surface of the first powder film, the pressing is performed by the first elastic pressing body provided with the surface sheet.
3. The production method of the all-solid-state battery according to claim 1 , wherein an outer perimeter enclosure surrounding an outer periphery of the first elastic pressing body is provided, and
wherein, in the step of pressing of the surface of the first powder film, the pressing is performed by the first elastic pressing body surrounded by the outer perimeter enclosure.
4. The production method of the all-solid-state battery according to claim 1 , wherein a modulus of elasticity of the first elastic pressing body is 100 MPa or less.
5. The production method of the all-solid-state battery according to claim 1 , wherein a pressing pressure in the step of pressing of the surface of the first powder film is 10 MPa or less.
6. The production method of the all-solid-state battery according to claim 2 , wherein the surface sheet is a metal foil.
7. The production method of the all-solid-state battery according to claim 2 , wherein a thickness of the surface sheet is 100 μm or less.
8. The production method of the all-solid-state battery according to claim 1 , wherein the first powder film is formed for constituting the positive electrode layer, and the second powder film is formed for constituting the solid electrolyte layer.
9. The production method of the all-solid-state battery according to claim 1 , wherein a modulus of elasticity of the first elastic pressing body is 5 MPa or more and 50 MPa or less.
10. The production method of the all-solid-state battery according to claim 1 , further comprising:
subsequently forming, on the second layer, a third powder film for constituting the other of the positive electrode layer and the negative electrode layer; and
pressing a surface of the third powder film by a third elastic pressing body to form a third layer, the third layer being the other of the positive electrode layer and the negative electrode layer, the third elastic pressing body being either the same as the first elastic pressing body or the second elastic pressing body or different from any of the first elastic pressing body or the second elastic pressing body.