EP-4742356-A1 - METHOD FOR MANUFACTURING ALL-SOLID-STATE BATTERY, APPARATUS FOR MANUFACTURING ALL-SOLID-STATE BATTERY, AND ALL-SOLID-STATE BATTERY

EP4742356A1EP 4742356 A1EP4742356 A1EP 4742356A1EP-4742356-A1

Abstract

A method of producing an all-solid-state battery 1 includes a cell forming step of forming a cell 2 including a positive electrode layer 21 made of a powder containing a positive electrode active material, a negative electrode layer 22 made of a powder containing a negative electrode active material, and a solid electrolyte layer 23 disposed between the positive electrode layer 21 and the negative electrode layer 22 and made of a powder of a solid electrolyte on a first substrate F1 in a dry process, a press step of laminating a second substrate F2 on the cell 2 and then pressing an laminate L obtained, a peeling step of peeling at least one of the first substrate F1 and the second substrate F2 from the cell 2, and a laminating step of alternately laminating the cell 2 and the current collector 3 so that one current collector 3 is disposed between two cells 2.

Inventors

KAWASE, Hirokazu

Assignees

Kanadevia Corporation

Dates

Publication Date: 20260513
Application Date: 20240619

Claims (14)

A method of producing an all-solid-state battery, the method comprising: a cell forming step of forming a cell on a first substrate in a dry process, the cell including a positive electrode layer made of a powder containing a positive electrode active material, a negative electrode layer made of a powder containing a negative electrode active material, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer and made of a powder of a solid electrolyte; a press step of laminating a second substrate on the cell and then pressing a laminate produced by the lamination; a peeling step of peeling at least one of the first substrate and the second substrate from the cell; and a laminating step of alternately laminating the cell and a current collector so that the current collector is disposed between two of the cells.
The method according to claim 1, wherein the laminating step includes: a first step of laminating the current collector on a first cell; and a second step of laminating a second cell on the current collector, following the first step, wherein, in the second step, when the negative electrode layer of the first cell is in contact with the current collector, the second cell is laminated on the current collector so that the negative electrode layer of the second cell is in contact with the current collector, and when the positive electrode layer of the first cell is in contact with the current collector, the second cell is laminated on the current collector so that the positive electrode layer of the second cell is in contact with the current collector.
The method according to claim 1, wherein the current collector includes: a conductor; and an insulating member laminated on a peripheral edge portion of the conductor, wherein in the laminating step, the cell is laminated on the conductor, and the insulating member is disposed around the cell.
The method according to claim 3, wherein the insulating member is laminated on a one-side surface of the conductor, and wherein the current collector further includes an adhesive layer laminated on an other-side surface of the conductor in the peripheral edge portion of the conductor.
The method according to claim 3, wherein the current collector includes a notch cut from an edge of the conductor inwardly through the insulating member, and wherein in the laminating step, a jig is disposed in the notch to determine a position of the cell with respect to the current collector so that an edge of the cell is in contact with the jig.
A production apparatus for producing an all-solid-state battery, the production apparatus used in the method according to claim 5, the production apparatus comprising: a support table capable of supporting the current collector; a first movement member disposed at one side of the support table in a first direction, including a first jig, and capable of moving in the first direction between a first separated position away from the support table and a first proximate position closer to the support table than the first separated position; a second movement member disposed at the other side of the support table in the first direction, including a second jig, and capable of moving in the first direction between a second separated position away from the support table and a second proximate position closer to the support table than the second separated position; a third movement member disposed at one side of the support table in a second direction perpendicular to the first direction, including a third jig, and capable of moving in the second direction between a third separated position away from the support table and a third proximate position closer to the support table than the third separated position; and a fourth movement member disposed at the other side of the support table in the second direction, including a fourth jig, and capable of moving in the second direction between a fourth separated position away from the support table and a fourth proximate position closer to the support table than the fourth separated position, wherein the current collector includes a first notch, a second notch, a third notch, and a fourth notch, wherein in a state in which the current collector is placed on the support table, the first notch is disposed in one end portion of the current collector in the first direction, the second notch is disposed in the other end portion of the current collector in the first direction, the third notch is disposed in one end portion of the current collector in the second direction, and the fourth notch is disposed in the other end portion of the current collector in the second direction, wherein in a state in which the current collector is placed on the support table, and the first movement member is disposed at the first proximate position, the first jig is disposed in the first notch, wherein in a state in which the current collector is placed on the support table, and the second movement member is disposed at the second proximate position, the second jig is disposed in the second notch, wherein in a state in which the current collector is placed on the support table, and the third movement member is disposed at the third proximate position, the third jig is disposed in the third notch, and wherein in a state in which the current collector is placed on the support table, and the fourth movement member is disposed at the fourth proximate position, the fourth jig is disposed in the fourth notch.
The production apparatus according to claim 6, wherein in a state in which the current collector is placed on the support table, the cell is placed on the current collector, and the first movement member is disposed at the first proximate position, the second movement member is moved from the second separated position toward the second proximate position to allow the second jig to move the cell toward the first jig so that an edge of the cell is contact with the first jig to determine a position of the cell with respect to the current collector in the first direction, and wherein in a state in which the current collector is placed on the support table, the cell is placed on the current collector, and the third movement member is disposed at the third proximate position, the fourth movement member is moved from the fourth separated position toward the fourth proximate position to allow the fourth jig to move the cell toward the third jig so that an edge of the cell is contact with the third jig to determine a position of the cell with respect to the current collector in the second direction.
The production apparatus according to claim 6, further comprising: a position determining member fixed to the support table to determine a position of the current collector with respect to the support table.
The production apparatus according to claim 8, wherein the position determining member includes: a first position determining portion disposed in one end portion of the support table in the first direction; and a second position determining portion disposed in one end portion of the support table in the second direction, wherein the production apparatus further comprises: a fifth movement member disposed at the other side of the support table in the first direction, and capable of moving in the first direction between a fifth separated position away from the support table and a fifth proximate position closer to the support table than the fifth separated position, the fifth movement member being moved from the fifth separated position toward the fifth proximate position to move the current collector placed on the support table toward the first position determining portion; and a sixth movement member disposed at the other side of the support table in the second direction, and capable of moving in the first direction between a sixth separated position away from the support table and a sixth proximate position closer to the support table than the sixth separated position, the sixth movement member being moved from the sixth separated position toward the sixth proximate position to move the current collector placed on the support table toward the second position determining portion.
The production apparatus according to claim 6, wherein each of the first jig, the second jig, the third jig, and the fourth jig is a rod extending in a lamination direction in which the cell and the current collector are laminated.
An all-solid-state battery comprising: a plurality of cells each including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer; and a plurality of current collectors, wherein the cell and the current collector are alternately laminated so that the current collector is disposed between two of the cells, and wherein the current collector includes a conductor in contact with the cell, and an insulating member laminated on a peripheral edge portion of the conductor.
The all-solid-state battery according to claim 11, wherein the current collector includes a notch cut from an edge of the conductor inwardly through the insulating member.
An all-solid-state battery comprising: a cell including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer; and a current collector including a notch in a peripheral edge portion.
The all-solid-state battery according to claim 13, wherein the current collector includes: a conductor in contact with the cell; and an insulating member laminated on a peripheral edge portion of the conductor, and disposed around the cell, and wherein the notch is cut from an edge of the conductor inwardly through the insulating member.

Description

TECHNICAL FIELD The present invention relates to a method of producing an all-solid-state battery, a production apparatus for producing an all-solid-state battery, and an all-solid-state battery. BACKGROUND ART Conventionally, there has been known an all-solid-state battery including an electrode layer body including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer, a positive current collector in contact with the positive electrode layer of the electrode layer body, and a negative current collector in contact with the negative electrode layer of the electrode layer body (see Patent Document 1 below). Citation List Patent Document Patent Document 1: Japanese Unexamined Patent Publication No. 2018-125268 SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION Of the all-solid-state battery as described in Patent Document 1, further improvement in the energy density is required. The present invention provides a method of producing an all-solid-state battery and an all-solid-state battery, in both of which the energy density can be improved. MEANS FOR SOLVING THE PROBLEM The present invention [1] includes a method of producing an all-solid-state battery, the method comprising: a cell forming step of forming a cell on a first substrate in a dry process, the cell including a positive electrode layer made of a powder containing a positive electrode active material, a negative electrode layer made of a powder containing a negative electrode active material, and a solid electrolyte layer disposed between the positive electrode layer and the negative electrode layer and made of a powder of a solid electrolyte; a press step of laminating a second substrate on the cell and then pressing a laminate produced by the lamination; a peeling step of peeling at least one of the first substrate and the second substrate from the cell; and a laminating step of alternately laminating the cell and a current collector so that the current collector is disposed between two of the cells. According to such a method, the cell formed on the first substrate in a dry process is pressed and solidified between the first substrate and the second substrate, and thereafter at least one of the first substrate and the second substrate is peeled, and the cell and the current collector are alternately laminated so that one current collector is disposed between two cells. In this manner, it is possible to produce an all-solid-state battery that is a bi-cell type and includes a cell produced by a dry process. Therefore, as compared with an all-solid-state battery including a cell produced by a wet process, the all-solid-state battery produced as described above allows for the suppression of a decrease in power generation efficiency caused by a void generated in a cell when the solvent volatilizes and a resin such as a binder. Furthermore, the all-solid-state battery produced as described above is bi-cell type, and thus allows for the reduction in volume and weight. As a result, the method of producing the all-solid-state battery of the present invention allows for the improvement in the energy density of the all-solid-state battery produced by the method. The present invention [2] includes the method described in the above-described [1], wherein the laminating step includes: a first step of laminating the current collector on a first cell; and a second step of laminating a second cell on the current collector, following the first step, wherein, in the second step, when the negative electrode layer of the first cell is in contact with the current collector, the second cell is laminated on the current collector so that the negative electrode layer of the second cell is in contact with the current collector, and when the positive electrode layer of the first cell is in contact with the current collector, the second cell is laminated on the current collector so that the positive electrode layer of the second cell is in contact with the current collector. According to such a method, it is possible to produce a bi-cell type all-solid-state battery where the first cell and the second cell are in contact with one current collector. The present invention [3] includes the method described in the above-described [1] or [2], wherein the current collector includes: a conductor; and an insulating member laminated on a peripheral edge portion of the conductor, wherein in the laminating step, the cell is laminated on the conductor, and the insulating member is disposed around the cell. According to such a method, the current collector in which the insulating member is laminated on the peripheral edge portion of the conductor is used, and thus it is possible to produce an all-solid-state battery in a simple step of alternately laminating the cell and the current collector. The present invention [4] includes the method described in the above-descr