CN-122025527-A - Solid-state battery

CN122025527ACN 122025527 ACN122025527 ACN 122025527ACN-122025527-A

Abstract

The present invention relates to a solid-state battery. The solid-state battery includes a plurality of unit electrode stacks. The unit electrode stacks each include at least a first current collector layer, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector layer. The solid-state battery further includes an adhesive layer between two of the unit electrode stacks adjacent to each other. The product of the area ratio (unit: area%) of the adhesive layer on the surface of the unit electrode laminate that contacts the adhesive layer and the thickness (unit: mm) of the unit electrode laminate is 12 or less.

Inventors

Sakamoto Dragons

Assignees

丰田自动车株式会社

Dates

Publication Date: 20260512
Application Date: 20250829
Priority Date: 20241111

Claims (4)

1. A solid-state battery includes a plurality of unit electrode stacks, in which Each of the unit electrode stacks includes at least a first current collector layer, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector layer, The solid-state battery further comprises an adhesive layer between two of the unit electrode stacks adjacent to each other, and The product of the area ratio of the adhesive layer on the surface of the unit electrode laminate, which is in contact with the adhesive layer, expressed in area%, and the thickness of the unit electrode laminate, expressed in millimeters, is 12 or less.
2. The solid-state battery according to claim 1, wherein the thickness of the unit electrode stack is 0.15mm to 1mm.
3. The solid-state battery according to claim 1, wherein the adhesive layer has conductivity.
4. The solid-state battery according to claim 1, wherein a product of an area ratio of the adhesive layer on a surface of the unit electrode stack in contact with the adhesive layer and a thickness of the unit electrode stack is 8 or more and 12 or less.

Description

Solid-state battery Technical Field The present disclosure relates to a solid-state battery. Background For example, a battery described in japanese patent application laid-open 2020-140932 (JP 2020-140932A) is known as a battery in which a current collector layer and an active material layer in a unit electrode stack are bonded by an adhesive layer. JP2020-140932A discloses an all-solid battery comprising two or more stacked battery cells having a monopolar structure. The stacked battery cells each have a configuration in which a first current collector layer, a first active material layer, a solid electrolyte layer, a second active material layer, a second current collector layer, a second active material layer, a solid electrolyte layer, a first active material layer, and a first current collector layer are sequentially stacked. The adjacently stacked first current collector layer and first active material layer are bonded to each other with an adhesive. Disclosure of Invention When the unit electrode stacks are bonded to each other, thickness unevenness of the active material layer or the like may cause stress between layers, resulting in interlayer peeling. The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a solid-state battery excellent in suppressing interlayer peeling in a unit electrode stack. Means for solving the above-described problems include the following. <1> A solid-state battery comprising a plurality of unit electrode stacks (unit electrode laminates). The unit electrode stacks each include at least a first current collector layer, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector layer. The solid-state battery further includes an adhesive layer between two of the unit electrode stacks adjacent to each other. The product of the area ratio of the adhesive layer on the surface of the unit electrode laminate, which is in contact with the adhesive layer, and the thickness of the unit electrode laminate is 12 or less. The area ratio is expressed in area%. The thickness is expressed in millimeters. <2> In the solid-state battery according to <1>, the thickness of the unit electrode stack is 0.15mm to 1mm. <3> In the solid-state battery according to <1>, the adhesive layer has conductivity. <4> In the solid-state battery according to <1>, the product of the area ratio of the adhesive layer on the surface of the unit electrode stack, which is in contact with the adhesive layer, and the thickness of the unit electrode stack is 8 or more and 12 or less. According to the present disclosure, a solid-state battery excellent in suppressing interlayer peeling in a unit electrode stack can be provided. Drawings Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and in which: fig. 1 is a schematic partial cross-sectional view of a solid-state battery according to an embodiment of the present disclosure. Detailed Description Hereinafter, a solid-state battery according to the present disclosure will be described in detail with reference to the accompanying drawings. The drawings shown below are schematic diagrams, and the size and shape of the parts are appropriately enlarged for understanding. Solid-state battery The solid-state battery according to the present disclosure includes a plurality of unit electrode stacks. The unit electrode stacks each include at least a first current collector layer, a first active material layer, a solid electrolyte layer, a second active material layer, and a second current collector layer. The solid-state battery further includes an adhesive layer between two of the unit electrode stacks adjacent to each other. The product of the area ratio (unit: area%) of the adhesive layer on the surface of the unit electrode laminate that contacts the adhesive layer and the thickness (unit: mm) of the unit electrode laminate is 12 or less. Hereinafter, a solid-state battery according to the present disclosure will be described with reference to the accompanying drawings. Fig. 1 is a schematic partial cross-sectional view of a solid-state battery according to an embodiment of the present disclosure. The solid-state battery 10 in fig. 1 includes a plurality of unit electrode stacks 22. The unit electrode stack 22 in fig. 1 includes a first current collector layer 12, a first active material layer 14, a solid electrolyte layer 16, a second active material layer 18, a second current collector layer 12, a second active material layer 18, a solid electrolyte layer 16, a first active material layer 14, and a third current collector layer 12. The arrangement of the layers of the unit electrode stack 22 in the present disclosure is not particularly limited as long as the uni