# US 2021/0280915 A1 · All solid battery and manufacturing method of the same

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

- Number: US 2021/0280915 A1
- Document ID: US20210280915A1
- Status: Published application
- Kind: A1
- Application number: 17/153,493
- Filed: 2021-01-20
- Published: 2021-09-09
- Earliest claimed: 2020-03-03
- Assignees: Taiyo Yuden Co., Ltd.
- Applicants: Taiyo Yuden Co., Ltd.
- Inventors: Masashi SEKIGUCHI; Daigo ITO
- Web page: https://patentgrep.com/patent/US20210280915A1

## CPC

- 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 10/0562: Solid materials
- H01M 2300/0068: inorganic
- H01M 2300/0071: Oxides
- H01M 2300/0094: in the form of layered products, e.g. coatings
- 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

An all solid battery includes a multilayer structure in which solid electrolyte layers and internal electrodes are alternately stacked, the plurality of internal electrodes including an electrode active material and a carbon material, the multilayer structure having a rectangular parallelepiped shape, the plurality of internal electrodes being alternately exposed to two different faces of the multilayer structure, a first cover layer provided on an upper face of the multilayer structure in a stacking direction, and a second cover layer provided on a lower face of the multilayer structure in the stacking direction. Each thickness of the plurality of internal electrodes is equal to or more than each thickness of the plurality of solid electrolyte layers. Vickers hardness of the plurality of solid electrolyte layers and Vickers hardness of the first and second cover layers are larger than Vickers hardness of the plurality of internal electrodes.

## Claims

### Claim 1

An all solid battery comprising:
a multilayer structure in which each of a plurality of solid electrolyte layers and each of a plurality of internal electrodes are alternately stacked, the plurality of internal electrodes including an electrode active material and a carbon material, the multilayer structure having a rectangular parallelepiped shape, the plurality of internal electrodes being alternately exposed to two different faces of the multilayer structure;
a first cover layer provided on an upper face of the multilayer structure in a stacking direction; and
a second cover layer provided on a lower face of the multilayer structure in the stacking direction,
wherein each thickness of the plurality of internal electrodes is equal to or more than each thickness of the plurality of solid electrolyte layers, and
wherein Vickers hardness of the plurality of solid electrolyte layers and Vickers hardness of the first and second cover layers are larger than Vickers hardness of the plurality of internal electrodes.

### Claim 2 (depends on 1)

The all solid battery as claimed in claim 1, wherein the Vickers hardness (Hv) of the plurality of solid electrolyte layers is 300 or more.

### Claim 3 (depends on 1)

The all solid battery as claimed in claim 1, wherein the Vickers hardness (Hv) of the first and second cover layers is 280 or more.

### Claim 4 (depends on 1)

The all solid battery as claimed in claim 1, wherein the Vickers hardness of the plurality of solid electrolyte layers is larger than the Vickers hardness of the first and second cover layers.

### Claim 5 (depends on 1)

The all solid battery as claimed in claim 1, wherein a main component of the first and second cover layers is an inorganic material.

### Claim 6 (depends on 1)

The all solid battery as claimed in claim 1, wherein solid electrolyte in the plurality of solid electrolyte layers has a NASICON type crystal structure.

### Claim 7

A manufacturing method of an all solid battery comprising:
preparing a multilayer structure including a multilayer portion, a first cover sheet on an upper face of the multilayer portion in a stacking direction, and a second cover sheet on a lower face of the multilayer portion in the stacking direction, the multilayer portion having a structure in which a solid electrolyte green sheet that includes a solid electrolyte and a first sintering assistant and a pattern of paste for internal electrode that includes an electrode active material and a carbon material and has a thickness that is equal to or more than a thickness of the solid electrolyte green sheet are stacked, the first cover sheet and the second cover sheet including a second sintering assistant;
firing the multilayer structure,
wherein an amount of the first sintering assistant added to the solid electrolyte green sheet and an amount of the second sintering assistant added to the first and second cover sheets are adjusted so that Vickers hardness of a solid electrolyte layer formed by firing the solid electrolyte green sheet and Vickers hardness of cover layers formed by firing the first and second cover sheets are larger than Vickers harness of an internal electrode layer formed by firing the pattern.

### Claim 8 (depends on 7)

The method as claimed in claim 7, wherein the amount of the first sintering assistant added to the solid electrolyte green sheet is 0.3 mol % or more, and
wherein the amount of the second sintering assistant added to the first and second cover sheets is 0.3 mol % or more.