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DE-102025129634-A1 - SOLID BATTERY

DE102025129634A1DE 102025129634 A1DE102025129634 A1DE 102025129634A1DE-102025129634-A1

Abstract

A solid-state battery comprises a plurality of unit electrode laminates. Each unit electrode laminate comprises 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 adjacent unit electrode laminates. The product of the area ratio (unit: area percent) of the adhesive layer on a surface of the unit electrode laminate to which the adhesive layer is attached and the thickness (unit: mm) of the unit electrode laminate is 12 or less.

Inventors

  • Ryuto SAKAMOTO

Assignees

  • TOYOTA JIDOSHA KABUSHIKI KAISHA

Dates

Publication Date
20260513
Application Date
20250728
Priority Date
20241111

Claims (4)

  1. Solid-state battery with a plurality of unit electrode laminates, wherein each of the unit electrode laminates comprises 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 laminates that are adjacent to each other, and a product of an area ratio of the adhesive layer on a surface of the unit electrode laminate where the adhesive layer is in contact and a thickness of the unit electrode laminate is 12 or less, wherein the area ratio is expressed in units of area percent and the thickness in units of millimeters.
  2. Solid state battery according to Claim 1 , where the thickness of the unit electrode laminate is 0.15 mm to 1 mm.
  3. Solid state battery according to Claim 1 , wherein the adhesive layer is electrically conductive.
  4. Solid state battery according to Claim 1 , wherein the product of the area ratio of the adhesive layer on the surface of the unit electrode laminate where the adhesive layer is in contact and the thickness of the unit electrode laminate is 8 or more and 12 or less.

Description

BACKGROUND OF THE INVENTION 1. Field of the invention The present disclosure relates to a solid-state battery. 2. Description of the state of the art For example, a battery described in Japanese patent application publication no. 2020-140932 ( JP 2020 - 140 932 A ) is described as a battery in which a current collector layer and an active material layer are connected in a unit electrode laminate by an adhesive layer. JP 2020 - 140 932 A Disclosure reveals a solid-state battery comprising two or more layered battery units with a monopolar structure. The stacked battery units 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 layered in that order. The first current collector layer and the first active material layer, which are layered side by side, are bonded together with an adhesive. OVERVIEW OF THE INVENTION When unit electrode laminates are bonded together, uneven thickness of the active material layer, etc., can cause stresses between the layers, leading to delamination. The present disclosure was made in view of the above circumstances and aims to provide a solid-state battery that excels in suppressing delamination within a unit electrode laminate. The means to solve the above problem include the following aspects. <1> A solid-state battery comprises a plurality of unit electrode laminates. Each unit electrode laminate has 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 any two adjacent unit electrode laminates. The product of the area ratio of the adhesive layer on a surface of the unit electrode laminate where the adhesive layer is in contact and the thickness of the unit electrode laminate is 12 or less. The area ratio is expressed in units of area percent. The thickness is expressed in units of millimeters. <2> In the solid-state battery according to <1>, the thickness of the unit electrode laminate is 0.15 mm to 1 mm. <3> In the solid-state battery according to <1>, the adhesive layer has electrical 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 lamina to which the adhesive layer is attached and the thickness of the unit electrode lamina is 8 or more and 12 or less. According to the present disclosure, it is possible to provide a solid-state battery that excellently suppresses delamination inside the unit electrode laminate. BRIEF DESCRIPTION OF THE DRAWINGS Features, advantages and technical and industrial significance of exemplary embodiments of the invention are described below with reference to the accompanying drawings, in which the same symbols denote the same elements and in which: 1 is a schematic partial sectional view of a solid-state battery according to an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EXECUTION FORMS The solid-state battery according to the present disclosure is described in detail below with reference to the drawings. Each drawing shown below is a schematic drawing, and the size and shape of the individual parts are exaggerated as appropriate to facilitate understanding. Solid state battery The solid-state battery according to the present disclosure comprises a plurality of unit electrode laminates. Each of the unit electrode laminates comprises 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 laminates adjacent to one another. The product of an area ratio (unit: area percent) of the adhesive layer on a surface of the unit electrode laminate to which the adhesive layer is attached and a thickness (unit: mm) of the unit electrode laminate is 12 or less. The solid-state battery according to the present disclosure is described below with reference to the drawings. 1 is a schematic partial sectional view of a solid-state battery according to an embodiment of the present disclosure. A solid-state battery 10 in 1 includes a variety of unit electrode laminates 22. The unit electrode laminate 22 in 1 comprises 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, the second active material layer 18, the solid electrolyte layer 16, the first active material layer 14, and a third current collector layer 12. The configuration of the layers of the unit electrode lamina 22 in th