# US 10,873,089 B2 · Positive electrode material and lithium secondary battery using the same

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- Number: US 10,873,089 B2
- Document ID: US10873089B2
- Status: Granted
- Kind: B2
- Application number: 16/214,347
- Filed: 2018-12-10
- Published: 2019-06-13
- Granted: 2020-12-22
- Earliest claimed: 2017-12-12
- Assignees: Toyota Jidosha Kabushiki Kaisha; National University Corporation Okayama University
- Applicants: Toyota Jidosha Kabushiki Kaisha; National University Corporation Okayama University
- Inventors: Daisuke Horikawa; Ryuta Sugiura; Takashi Teranishi
- Web page: https://patentgrep.com/patent/US10873089B2

## CPC

- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 4/366: {as layered products}
- 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 4/62: Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01M 10/4235: {Safety or regulating additives or arrangements in electrodes, separators or electrolyte (H01M10/4242 takes precedence)}
- H01M 10/052: Li-accumulators
- 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
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A positive electrode material for a lithium secondary battery of the present disclosure includes a positive electrode active material, a barium titanate-based dielectric, and at least one of Compound I which contains the element Ba and has the largest peak at a position with 2θ=24° to 26° in an X-ray diffraction pattern obtained according to X-ray diffraction measurement using CuKα rays; and Compound II which contains the element Ti and has the largest peak at a position with 2θ=26° to 28° in an X-ray diffraction pattern obtained according to X-ray diffraction measurement using CuKα rays. At least one of Compounds I and II is disposed in contact with the dielectric.

## Claims

### Claim 1

A positive electrode material for a lithium secondary battery comprising:
a positive electrode active material;
a barium titanate-based dielectric; and
at least one of a following Compounds I and II:
Compound I: a compound which contains an element Ba and has a largest peak at a position with 2θ=24° to 26° in an X-ray diffraction pattern obtained according to X-ray diffraction measurement using CuKα rays; and
Compound II: a compound which contains an element Ti and has a largest peak at a position with 2θ=26° to 28° in the X-ray diffraction pattern obtained according to X-ray diffraction measurement using CuKα rays,
wherein at least one of Compounds I and II is disposed in contact with the dielectric.

### Claim 2 (depends on 1)

The positive electrode material according to claim 1, wherein a content proportion of the dielectric is 0.1 mol % or more and 10 mol % or less with respect to 100 mol % of the positive electrode active material.

### Claim 3 (depends on 1)

The positive electrode material according to claim 1, wherein a content proportion of at least one of Compounds I and II is 0.001 mol % or more and 5 mol % or less with respect to 100 mol % of the positive electrode active material.

### Claim 4 (depends on 1)

The positive electrode material according to claim 1, wherein at least one of Compounds I and II is fused to the dielectric.

### Claim 5 (depends on 1)

A lithium secondary battery comprising:
a positive electrode including the positive electrode material according to claim 1.