# US 2022/0285677 A1 · Negative electrode material for lithium ion battery

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- Number: US 2022/0285677 A1
- Document ID: US20220285677A1
- Status: Published application
- Kind: A1
- Application number: 17/583,389
- Filed: 2022-01-25
- Published: 2022-09-08
- Earliest claimed: 2021-03-05
- Assignees: Mazda Motor Corporation
- Applicants: Mazda Motor Corporation
- Inventors: Suguru IKEDA; Hiroki FUJITA; Hackho KIM
- Web page: https://patentgrep.com/patent/US20220285677A1

## CPC

- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/364: {as mixtures}
- H01M 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- H01M 2004/027: {Negative electrodes}
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

To improve the cycle characteristics of a lithium ion battery, a mixture of a powder of a conversion-type oxide made of an iron oxide and/or a silicon oxide and causing a conversion reaction with Li ions and a powder of an oxygen ion conductor are used as a negative electrode material of the lithium ion battery.

## Claims

### Claim 1

A negative electrode material for a lithium ion battery, the negative electrode material comprising
a mixture of a powder of a conversion-type oxide and a powder of an oxygen ion conductor, the conversion-type oxide being made of an iron oxide and/or a silicon oxide and causing a conversion reaction with Li ions.

### Claim 2 (depends on 1)

The negative electrode material of claim 1, wherein
the conversion-type oxide is made of magnetite, and
the oxygen ion conductor is made of samarium-doped ceria and/or yttria-stabilized zirconium.

### Claim 3 (depends on 1)

The negative electrode material of claim 1, wherein
a proportion of the powder of the oxygen ion conductor in a total amount of the powder of the conversion-type oxide and the powder of the oxygen ion conductor is 3 mass % or more and 30 mass % or less.

### Claim 4 (depends on 2)

The negative electrode material of claim 2, wherein
a proportion of the powder of the oxygen ion conductor in a total amount of the powder of the conversion-type oxide and the powder of the oxygen ion conductor is 3 mass % or more and 30 mass % or less.

### Claim 5 (depends on 1)

The negative electrode material of claim 1, wherein
the oxygen ion conductor has an average particle size D50, with reference to volume, of 1 nm or more and 100 nm or less.

### Claim 6 (depends on 2)

The negative electrode material of claim 2, wherein
the oxygen ion conductor has an average particle size D50, with reference to volume, of 1 nm or more and 100 nm or less.

### Claim 7 (depends on 3)

The negative electrode material of claim 3, wherein
the oxygen ion conductor has an average particle size D50, with reference to volume, of 1 nm or more and 100 nm or less.

### Claim 8 (depends on 5)

The negative electrode material of claim 5, wherein
the conversion-type oxide is magnetite particles having an average particle size D50, with reference to volume, of 10 nm or more and 1000 nm or less.

### Claim 9 (depends on 6)

The negative electrode material of claim 6, wherein
the conversion-type oxide is magnetite particles having an average particle size D50, with reference to volume, of 10 nm or more and 1000 nm or less.

### Claim 10 (depends on 7)

The negative electrode material of claim 7, wherein
the conversion-type oxide is magnetite particles having an average particle size D50, with reference to volume, of 10 nm or more and 1000 nm or less.