# US 11,909,049 B2 · Positive electrode, non-aqueous electrolyte secondary battery, and method of producing positive electrode

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- Number: US 11,909,049 B2
- Document ID: US11909049B2
- Status: Granted
- Kind: B2
- Application number: 16/589,281
- Filed: 2019-10-01
- Published: 2020-04-16
- Granted: 2024-02-20
- Earliest claimed: 2018-10-10
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Koji Torita; Takuya Asari; Akihiro Ochiai; Yusuke Fukumoto; Naoyuki Wada
- Web page: https://patentgrep.com/patent/US11909049B2

## CPC

- H01M 4/661: {Metal or alloys, e.g. alloy coatings (H01M4/669 take precedence)}
- C22C 21/00: Alloys based on aluminium
- H01M 4/04: Processes of manufacture in general
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- 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 4/667: {in the form of layers, e.g. coatings}
- 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
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A positive electrode includes at least a positive electrode current collector and a positive electrode active material layer. The positive electrode active material layer is disposed on a surface of the positive electrode current collector. The positive electrode current collector includes an aluminum foil and an aluminum hydrated oxide film. The aluminum hydrated oxide film covers a surface of the aluminum foil. The aluminum hydrated oxide film has a thickness not smaller than 50 nm and not greater than 500 nm. The aluminum hydrated oxide film contains a plurality of types of aluminum hydrated oxides. The ratio of boehmite to the plurality of types of aluminum hydrated oxides is not lower than 20 mol % and not higher than 80 mol %.

## Claims

### Claim 1

A positive electrode for a non-aqueous electrolyte secondary battery, the positive electrode comprising at least:
a positive electrode current collector; and
a positive electrode active material layer,
the positive electrode active material layer being disposed on a surface of the positive electrode current collector,
the positive electrode current collector including an aluminum foil and an aluminum hydrated oxide film,
the aluminum hydrated oxide film covering a surface of the aluminum foil,
the aluminum hydrated oxide film having a thickness not smaller than 50 nm and less than 450 nm,
the aluminum hydrated oxide film consisting of not lower than 30 mol % and not higher than 50 mol % boehmite, and a remainder including at least one of diaspore, bayerite, and gibbsite.

### Claim 2 (depends on 1)

The positive electrode according to claim 1, wherein the aluminum hydrated oxide film has a thickness not greater than 150 nm.

### Claim 3 (depends on 1)

A non-aqueous electrolyte secondary battery comprising at least:
the positive electrode according to claim 1;
a negative electrode; and
a non-aqueous electrolyte.

### Claim 4 (depends on 1)

The positive electrode according to claim 1, wherein the aluminum hydrated oxide film has a thickness of not more than 350 nm.