# US 2019/0319271 A1 · Positive electrode active material, positive electrode, lithium-ion secondary battery, and method of producing positive electrode active material

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- Number: US 2019/0319271 A1
- Document ID: US20190319271A1
- Status: Published application
- Kind: A1
- Application number: 16/352,352
- Filed: 2019-03-13
- Published: 2019-10-17
- Earliest claimed: 2018-04-16
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Kunimitsu YAMAMOTO; Yoshinari MAKIMURA
- Web page: https://patentgrep.com/patent/US20190319271A1

## CPC

- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1393: of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/1397: of electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/364: {as mixtures}
- 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 4/5835: {Comprising fluorine or fluoride salts}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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
- 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

A positive electrode active material contains at least: fluorine in an amount not lower than 0.08 mass %; carbon in an amount not lower than 0.02 mass %; and lithium-metal composite oxide particles making up the remainder. The lithium-metal composite oxide particles contain nickel in an amount not lower than 60 mol % of the total amount of metallic elements. At least a partial amount of each of the fluorine and the carbon is present on surfaces of the lithium-metal composite oxide particles.

## Claims

### Claim 1

A positive electrode active material for a lithium-ion secondary battery, the positive electrode active material comprising at least:
fluorine in an amount not lower than 0.08 mass %;
carbon in an amount not lower than 0.02 mass %; and
lithium-metal composite oxide particles making up the remainder,
the lithium-metal composite oxide particles containing nickel in an amount not lower than 60 mol % of the total amount of metallic elements,
at least a partial amount of each of the fluorine and the carbon being present on surfaces of the lithium-metal composite oxide particles.

### Claim 2 (depends on 1)

The positive electrode active material according to claim 1, wherein the positive electrode active material comprises fluorine in an amount not higher than 0.61 mass %.

### Claim 3 (depends on 1)

The positive electrode active material according to claim 1, wherein the lithium-metal composite oxide particles have a composition represented by the following formula (I):
LiNixCoyAlzO2 (I)
where x, y, and z satisfy the following relations:
0.6≤x≤0.9;
x+y+z=1; and
y≥z.

### Claim 4 (depends on 1)

The positive electrode active material according to claim 1, wherein the lithium-metal composite oxide particles contain nickel in an amount not lower than 80 mol % of the total amount of metallic elements.

### Claim 5 (depends on 1)

A positive electrode including at least the positive electrode active material according to claim 1.

### Claim 6 (depends on 5)

A lithium-ion secondary battery including at least the positive electrode according to claim 5.

### Claim 7

A method of producing a positive electrode active material for a lithium-ion secondary battery, the method comprising at least:
preparing lithium-metal composite oxide particles;
mixing the lithium-metal composite oxide particles with a fluorocarbon material to prepare a mixture; and
heating the mixture in an inert atmosphere to produce the positive electrode active material,
the lithium-metal composite oxide particles containing nickel in an amount not lower than 60 mol % of the total amount of metallic elements,
a content of the fluorocarbon material in the mixture being determined so that the positive electrode active material contains at least fluorine in an amount not lower than 0.08 mass %, carbon in an amount not lower than 0.02 mass %, and the lithium-metal composite oxide particles making up the remainder.

### Claim 8 (depends on 7)

The method of producing a positive electrode active material according to claim 7, wherein
the fluorocarbon material is polytetrafluoroethylene, and
the mixture is heated at a temperature not lower than a temperature at which polytetrafluoroethylene breaks down to produce the positive electrode active material.

### Claim 9 (depends on 8)

The method of producing a positive electrode active material according to claim 8, wherein the mixture contains polytetrafluoroethylene in an amount not lower than 0.10 mass % of the amount of the mixture.

### Claim 10 (depends on 8)

The method of producing a positive electrode active material according to claim 8, wherein the mixture contains polytetrafluoroethylene in an amount not higher than 0.80 mass % of the amount of the mixture.