# US 12,119,454 B2 · All solid battery and manufacturing method of the same

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- Number: US 12,119,454 B2
- Document ID: US12119454B2
- Status: Granted
- Kind: B2
- Application number: 17/153,493
- Filed: 2021-01-20
- Published: 2021-09-09
- Granted: 2024-10-15
- 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/US12119454B2

## 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, each of the plurality of internal electrodes consists of an electrode active material, a solid electrolyte and a conductive auxiliary agent, the multilayer structure having a rectangular parallelepiped shape, the plurality of internal electrodes being alternately exposed at two different faces of the multilayer structure to an outer surroundings 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, 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, wherein the plurality of solid electrolyte layers, the first cover layer and the second cover layer are made of Li1.3Al0.3Ge1.7(PO4)3, wherein each of the plurality of solid electrolyte layers, the first cover layer and the second cover layer includes a sintering assistant of Li3PO4, and wherein an amount of the sintering assistant in each of the plurality of solid electrolyte layers, the first cover layer and the second cover layer is 0.3 mol % or more and 10 mol % or less.

### 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 volume ratio of the conductive carbon material in each of the plurality of internal electrodes is 1 vol % or more and 50 vol % or less.

### Claim 6 (depends on 1)

The all solid battery as claimed in claim 1, wherein a thickness of each of the plurality of internal electrodes is larger than a thickness of each of the plurality of solid electrolyte layers.