Patent ID: 11876172
Assignee: HITACHI ZOSEN CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 2:
3. A method for producing an all-solid battery, comprising the steps of:
forming an electrode group including at least a unit cell including a positive electrode, a negative electrode, and a solid electrolyte layer being interposed between the positive electrode and the negative electrode and including an ion-conductive inorganic solid electrolyte; and
pressurizing the electrode group to plastically deform the inorganic solid electrolyte,
wherein the all-solid battery is a solid lithium-ion battery,
wherein the step of forming the electrode group includes
a sub-step A of forming one member A selected from the group consisting of the positive electrode, the negative electrode, and the solid electrolyte layer by use of compression molding under a pressure of 1 MPa or more and 4 MPa or less,
a sub-step B of forming one member B selected from of rest of the group on the member A by use of compression molding under a pressure of 1 MPa or more and 4 MPa or less, and
a sub-step C of forming one member C which is rest of the group on the member A or the member B by use of compression molding under a pressure of 1 MPa or more and 4 MPa or less,
wherein, in the step of forming the electrode group, the solid electrolyte layer is formed by using the inorganic solid electrolyte by a dry process,
wherein a pressure applied during the pressurizing the electrode group is 800 MPa or more,
wherein the positive electrode includes a positive electrode active material and an inorganic solid electrolyte,
wherein the negative electrode includes a negative electrode active material and an inorganic solid electrolyte,
wherein each of the inorganic solid electrolyte in the positive electrode and the negative electrode includes plastically deformed particles of a sulfide-based solid electrolyte at a pressure of 800 MPa or more after the pressurizing the electrode group,
wherein the inorganic solid electrolyte in the solid electrolyte layer includes plastically deformed particles of a sulfide-based solid electrolyte at a pressure of 800 MPa or more, and a part of the plastically deformed particles in the solid electrolyte layer is deformed together with a part of the plastically deformed particles included in each of the inorganic solid electrolyte in the positive electrode and the negative electrode, after the pressurizing the electrode group,
such that a resistance R1 of the unit cell when a pressure applied in a thickness direction of the unit cell is 100 kPa as small as 90 Ωcm2 or less, and a resistance R2 is a resistance of the unit cell when a pressure applied in the thickness direction is 60 MPa, produce an increase rate represented by (R1−R2)/R2×100 of 10% or less, and
wherein a pressure applied to the solid electrolyte layer is 100 kPa or less in the all-solid battery.