# US 10,770,719 B2 · Negative electrode active material and battery

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- Number: US 10,770,719 B2
- Document ID: US10770719B2
- Status: Granted
- Kind: B2
- Application number: 15/595,949
- Filed: 2017-05-16
- Published: 2017-11-30
- Granted: 2020-09-08
- Earliest claimed: 2016-05-27
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Akira Kano; Junko Matsushita; Nobuhiko Hojo
- Web page: https://patentgrep.com/patent/US10770719B2

## CPC

- H01M 4/364: {as mixtures}
- H01M 4/386: {Silicon or alloys based on silicon}
- H01M 4/483: {for non-aqueous cells (H01M4/485 takes precedence)}
- H01M 4/587: for inserting or intercalating light metals
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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

A negative electrode active material includes a carbon material including boron and a silicon material including at least one selected from silicon and silicon oxide. The silicon material does not include boron. A peak of a B1s spectrum of the carbon material occurs at a binding energy of 187.0 eV or more and 192.0 eV or less, the B1s spectrum being measured by X-ray photoelectron spectroscopy. The ratio of the area of the peak of the B1s spectrum of the carbon material which occurs at a binding energy of 187.0 eV or more and 192.0 eV or less, the B1s spectrum being measured by X-ray photoelectron spectroscopy, to the total area of peaks of the B1s spectrum which occur at a binding energy of 184.0 eV or more and 196.5 eV or less is 50% or more.

## Claims

### Claim 1

A negative electrode active material comprising:
a carbon material including boron; and
a silicon material including at least one selected from silicon and silicon oxide, wherein:
the silicon material does not include boron,
a peak of a B1s spectrum of the carbon material occurs at a binding energy of 187.0 eV or more and 188.5 eV or less, a B1s spectrum being measured by X-ray photoelectron spectroscopy,
the silicon oxide is SiOx, where 0.1≤x≤1.2,
a ratio of an amount of the silicon oxide included in the silicon material to a total amount of the negative electrode active material is 0.5% by weight or more and 50% by weight or less, and
a ratio of the area of the peak of the B1s spectrum of the carbon material which occurs at a binding energy of 187.0 eV or more and 188.5 eV or less to the total area of peaks of the B1s spectrum which occur at a binding energy of 184.0 eV or more and 196.5 eV or less is 50% or more.

### Claim 2 (depends on 1)

The negative electrode active material according to claim 1,
wherein a content of boron in the carbon material is 0.5% or more in terms of atomic mass of boron.

### Claim 3 (depends on 1)

The negative electrode active material according to claim 1,
wherein a surface of the silicon material is coated with carbon.

### Claim 4 (depends on 1)

The negative electrode active material according to claim 1,
wherein the carbon material includes nitrogen.

### Claim 5 (depends on 4)

The negative electrode active material according to claim 4,
wherein a content of nitrogen in the carbon material is 0.4% or more in terms of atomic mass of nitrogen.

### Claim 6 (depends on 1)

The negative electrode active material according to claim 1,
wherein the ratio of the amount of the silicon oxide included in the silicon material to the total amount of the negative electrode active material is 5% by weight or more and 50% by weight or less.

### Claim 7 (depends on 6)

The negative electrode active material according to claim 6,
wherein the silicon oxide is SiOx, where 0.8≤x≤1.2.

### Claim 8 (depends on 7)

The negative electrode active material according to claim 7,
wherein the ratio of the amount of the silicon oxide included in the silicon material to the total amount of the negative electrode active material is 5% by weight or more and 30% by weight or less.

### Claim 9

A battery comprising:
a negative electrode including a negative electrode active material;
a positive electrode; and
an electrolyte, wherein:
the negative electrode active material includes:
a carbon material including boron; and
a silicon material including at least one selected from silicon and silicon oxide;
a peak of a B1s spectrum of the carbon material occurs at a binding energy of 187.0 eV or more and 188.5 eV or less, the B1s spectrum being measured by X-ray photoelectron spectroscopy,
the silicon material do not include boron,
the silicon oxide is SiOx, where 0.1≤x≤1.2,
a ratio of an amount of the silicon oxide included in the silicon material to a total amount of the negative electrode active material is 0.5% by weight or more and 50% by weight or less, and
a ratio of the area of the peak of the B1s spectrum of the carbon material which occurs at a binding energy of 187.0 eV or more and 188.5 eV or less to the total area of peaks of the B1s spectrum which occur at a binding energy of 184.0 eV or more and 196.5 eV or less is 50% or more.

### Claim 10 (depends on 9)

The battery according to claim 9,
wherein the negative electrode active material is included in the negative electrode as a main component.