# US 12,224,398 B2 · All-solid-state sodium ion secondary battery

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

- Number: US 12,224,398 B2
- Document ID: US12224398B2
- Status: Granted
- Kind: B2
- Application number: 16/617,147
- Filed: 2018-06-07
- Published: 2020-04-09
- Granted: 2025-02-11
- Earliest claimed: 2017-06-28
- Assignees: Nippon Electric Glass Co., Ltd.
- Applicants: Nippon Electric Glass Co., Ltd.
- Inventors: Hideo Yamauchi
- Web page: https://patentgrep.com/patent/US12224398B2

## CPC

- H01M 10/0562: Solid materials
- H01M 10/054: Accumulators with insertion or intercalation of metals other than lithium, e.g. with magnesium or aluminium
- H01M 10/0585: of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
- H01B 1/06: mainly consisting of other non-metallic substances
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- 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
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- 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

Provided is an all-solid-state sodium ion secondary battery in which electrode layers are difficult to peel from a solid electrolyte layer and which has excellent cycle characteristics. An all-solid-state sodium ion secondary battery 1 according to the present invention includes: a solid electrolyte layer 2 having a first principal surface 2a and a second principal surface 2b opposite each other and made of a sodium ion-conductive oxide; a positive electrode layer 3 provided on the first principal surface 2a of the solid electrolyte layer 2; and a negative electrode layer 4 provided on the second principal surface 2b of the solid electrolyte layer 2, wherein at least one of the first principal surface 2a and the second principal surface 2b has an arithmetic mean roughness Ra of 0.05 μm or more.

## Claims

### Claim 1

An all-solid-state sodium ion secondary battery comprising:
a solid electrolyte layer having a first principal surface and a second principal surface opposite each other and made of a sodium ion-conductive oxide;
a positive electrode layer provided on the first principal surface of the solid electrolyte layer; and
a negative electrode layer provided on the second principal surface of the solid electrolyte layer, wherein
the first principal surface has an arithmetic mean roughness Ra of 1.8 μm or more and 3.2 μm or less,
the thickness of the positive electrode layer is in a range of 10 μm to 150 μm,
the positive electrode layer contains a positive-electrode active material including sodium transition metal phosphate crystals containing Na, M (where M represents at least one transition metal element selected from Cr, Fe, Mn, Co, V, and Ni), P, and O,
the solid electrolyte layer contains at least one solid electrolyte selected from the group consisting of β-alumina, β″-alumina, and NASICON crystals, and
the negative electrode layer contains a negative-electrode active material including crystals containing at least one selected from Nb and Ti, and O, metallic crystals of at least one selected from Sn, Bi, and Sb, and alloy crystals containing at least one selected from Sn, Bi, and Sb.

### Claim 2 (depends on 1)

The all-solid-state sodium ion secondary battery according to claim 1, wherein the second principal surface has an arithmetic mean roughness Ra of 0.47 μm or more.

### Claim 3 (depends on 1)

The all-solid-state sodium ion secondary battery according to claim 1, wherein the solid electrolyte layer has a thickness of not less than 10 μm and not more than 500 μm.

### Claim 4 (depends on 1)

The all-solid-state sodium ion secondary battery according to claim 1, wherein the positive-electrode active material is a sintered body of a positive-electrode active material precursor glass powder.