# US 12,002,925 B2 · Solid-state secondary battery

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 12,002,925 B2
- Document ID: US12002925B2
- Status: Granted
- Kind: B2
- Application number: 17/431,549
- Filed: 2020-03-06
- Published: 2022-05-05
- Granted: 2024-06-04
- Earliest claimed: 2019-03-08
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Taisuke Masuko; Kazumasa Tanaka
- Web page: https://patentgrep.com/patent/US12002925B2

## CPC

- H01M 10/0562: Solid materials
- H01M 10/0463: {Cells or batteries with horizontal or inclined electrodes}
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/056: characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A solid-state secondary battery includes: a positive electrode layer; a negative electrode layer; a solid-state electrolyte layer; and side margin layers arranged side by side on outer circumferences of the positive electrode layer and the negative electrode layer. The solid-state secondary battery is made of a laminated body obtained by alternately laminating the positive electrode layer of which the side margin layer arranged on the outer circumference thereof and the negative electrode layer of which the side margin layer arranged on the outer circumference thereof with the solid-state electrolyte layer arranged therebetween, and when the porosity of the side margin layers is defined as φm and the porosity of the solid-state electrolyte layer is defined as φe, the porosity ratio (φm/φe) satisfies the following Expression (1); 0.5≤(φm/φe)<1 . . . (1).

## Claims

### Claim 1

A solid-state secondary battery comprising:
a positive electrode layer including a positive electrode current collector layer and a positive electrode active material layer;
a negative electrode layer including a negative electrode current collector layer and a negative electrode active material layer;
a solid-state electrolyte layer including a solid-state electrolyte; and
side margin layers arranged side by side on outer circumferences of the positive electrode layer and the negative electrode layer,
wherein the solid-state secondary battery is made of a laminated body obtained by alternately laminating the positive electrode layer of which the side margin layer arranged on the outer circumference thereof and the negative electrode layer of which the side margin layer arranged on the outer circumference thereof with the solid-state electrolyte layer arranged therebetween, and
when the porosity of the side margin layers is defined as φm and the porosity of the solid-state electrolyte layer is defined as φe, a porosity ratio (φm/φe) satisfies the following Expression (1);
0.5≤(φm/φe)<1.0 (1).

### Claim 2 (depends on 1)

The solid-state secondary battery according to claim 1, wherein the porosity ratio (φm/φe) satisfies the following Expression (2);
0.6≤(φm/φe)<1.0 (2).

### Claim 3 (depends on 1)

The solid-state secondary battery according to claim 1, wherein the porosity φe of the solid-state electrolyte layer is 1.0%≤φe≤25.0%.

### Claim 4 (depends on 1)

The solid-state secondary battery according to claim 1, wherein an average circular area conversion diameter d of voids included in the solid-state electrolyte layer and the side margin layers is 0.1≤d<2.0 μm;
here, when the total area of n voids in a SEM image is defined as X, the average circular area conversion diameter d is calculated by the following Expression (3);
d={X/(n×π)}(1/2)×2 (3).

### Claim 5 (depends on 2)

The solid-state secondary battery according to claim 2, wherein the porosity φe of the solid-state electrolyte layer is 1.0%≤φe≤25.0%.

### Claim 6 (depends on 2)

The solid-state secondary battery according to claim 2, wherein an average circular area conversion diameter d of voids included in the solid-state electrolyte layer and the side margin layers is 0.1≤d<2.0 μm;
here, when the total area of n voids in a SEM image is defined as X, the average circular area conversion diameter d is calculated by the following Expression (3);
d={X/(n×π)}(1/2)×2 (3).

### Claim 7 (depends on 3)

The solid-state secondary battery according to claim 3, wherein an average circular area conversion diameter d of voids included in the solid-state electrolyte layer and the side margin layers is 0.1≤d<2.0 μm;
here, when the total area of n voids in a SEM image is defined as X, the average circular area conversion diameter d is calculated by the following Expression (3);
d={X/(n×π)}(1/2)×2 (3).

### Claim 8 (depends on 5)

The solid-state secondary battery according to claim 5, wherein an average circular area conversion diameter d of voids included in the solid-state electrolyte layer and the side margin layers is 0.1≤d<2.0 μm;
here, when the total area of n voids in a SEM image is defined as X, the average circular area conversion diameter d is calculated by the following Expression (3);
d={X/(n×π)}(1/2)×2 (3).

### Claim 9

A solid-state secondary battery comprising:
a positive electrode layer including a positive electrode current collector layer and a positive electrode active material layer;
a negative electrode layer including a negative electrode current collector layer and a negative electrode active material layer;
a solid-state electrolyte layer including a solid-state electrolyte; and
side margin layers arranged side by side on outer circumferences of the positive electrode layer and the negative electrode layer,
wherein the solid-state secondary battery is made of a laminated body formed by alternately laminating the positive electrode layer of which the side margin layer arranged on the outer circumference thereof and the negative electrode layer of which the side margin layer arranged on the outer circumference thereof with the solid-state electrolyte layer arranged therebetween, and
when the porosity of the side margin layers is defined as φm and the porosity of the solid-state electrolyte layer is defined as φe, a porosity ratio (φm/φe) satisfies the following Expression (4);
1.0≤(φm/φe)≤4.0 (4).

### Claim 10 (depends on 9)

The solid-state secondary battery according to claim 9, wherein the porosity φm of the side margin layers is 0.1%≤φm≤20.0%.

### Claim 11 (depends on 9)

The solid-state secondary battery according to claim 9, wherein an average circular area conversion diameter d of voids included in the solid-state electrolyte layer and the side margin layers is 0.05≤d≤2.00 μm;
here, when the total area of n voids in a SEM image is defined as X, the average circular area conversion diameter d is calculated by the following Expression (3);
d={X/(n×π)}(1/2)×2 (3).

### Claim 12 (depends on 10)

The solid-state secondary battery according to claim 10, wherein an average circular area conversion diameter d of voids included in the solid-state electrolyte layer and the side margin layers is 0.05≤d≤2.00 μm;
here, when the total area of n voids in a SEM image is defined as X, the average circular area conversion diameter d is calculated by the following Expression (3);
d={X/(n×π)}(1/2)×2 (3).