Method for manufacturing a stacked electrode body and method for manufacturing an all-solid-state secondary battery

Abstract

The present invention provides a method for manufacturing a laminated electrode body with low internal resistance, and a method for manufacturing an all-solid-state secondary battery with excellent load characteristics. [Solution] The method for manufacturing a laminated electrode body involves pressurizing sulfide-based solid electrolyte particles with a surface pressure of less than 120 MPa to form a first temporary layer for obtaining the solid electrolyte layer. A first electrode mixture is placed on one main surface of the first temporary layer, and the first electrode mixture is pressurized with a surface pressure of less than 1000 MPa to form a second temporary layer for obtaining the first electrode layer on one main surface of the first temporary layer. Then, a second electrode mixture for obtaining the second electrode layer is placed on the other main surface of the first temporary layer, and the second electrode mixture, the first temporary layer, and the second temporary layer are pressurized with a predetermined surface pressure to form a laminated electrode body. This suppresses cracking in each layer and makes the thickness of each layer uniform, thereby enabling the manufacture of a laminated electrode body with low internal resistance. By housing this laminated electrode body in a case, an all-solid-state secondary battery with excellent load characteristics can be manufactured.

Claims

1. A method for manufacturing a laminated electrode body having a solid electrolyte layer, a first electrode layer laminated on one main surface of the solid electrolyte layer, and a second electrode layer laminated on the other main surface of the solid electrolyte layer, A step of forming a first pre-formed layer for obtaining the solid electrolyte layer by pressurizing sulfide-based solid electrolyte particles with a surface pressure of less than 120 MPa, A step of placing the first electrode mixture on one main surface of the first temporary molded layer, A step of pressurizing the first electrode mixture with a surface pressure of less than 500 MPa to form a second temporary layer for obtaining the first electrode layer on one main surface of the first temporary layer, A step of placing a second electrode mixture for obtaining the second electrode layer on the other main surface of the first temporary molded layer, A method for manufacturing a laminated electrode, comprising the step of pressurizing the second electrode mixture, the first temporary molded layer, and the second temporary molded layer with a surface pressure of 1000 MPa or more to form the laminated electrode body.

2. A method for manufacturing a laminated electrode body according to claim 1, A method for manufacturing a laminated electrode, wherein, in the step of forming the first pre-formed layer, the sulfide-based solid electrolyte particles are pressurized with a surface pressure of 30 MPa or more.

3. A method for manufacturing a laminated electrode body according to claim 1 or 2, A method for manufacturing a laminated electrode, wherein, in the step of forming the second pre-formed layer, the first electrode mixture is pressurized with a surface pressure of 30 MPa or more.

4. A method for manufacturing an all-solid-state secondary battery, A method for manufacturing an all-solid-state secondary battery, comprising the step of housing the laminated electrode body manufactured by the method for manufacturing a laminated electrode body described in any one of claims 1 to 3 inside a case.

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