# US 12,002,945 B2 · Positive electrode active material for non-aqueous electrolyte secondary battery, positive electrode for non-aqueous electrolyte secondary battery, and non-aqueous electrolyte secondary battery

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- Number: US 12,002,945 B2
- Document ID: US12002945B2
- Status: Granted
- Kind: B2
- Application number: 17/044,609
- Filed: 2019-02-26
- Published: 2021-04-08
- Granted: 2024-06-04
- Earliest claimed: 2018-04-06
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Akihiro Kawakita; Takeshi Ogasawara
- Web page: https://patentgrep.com/patent/US12002945B2

## CPC

- C01G 53/40: Complex oxides containing nickel and at least one other metal element
- H01M 4/364: {as mixtures}
- C01G 53/42: containing alkali metals, e.g. LiNiO2
- C01G 53/506: with the molar ratio of nickel with respect to all the metals other than alkali metals higher than or equal to 0.8, e.g. Li(MzNixCoyMn1-x-y-z)O2 with x ≥ 0.8
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/366: {as layered products}
- H01M 4/382: {Lithium (H01M4/405 takes precedence)}
- H01M 4/485: of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence)
- H01M 4/523: {for non-aqueous cells (H01M4/525 takes precedence)}
- 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 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/12: Surface area
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0017: Non-aqueous electrolytes
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- 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 lithium-containing complex transition metal oxide forming the positive electrode active material of a non-aqueous electrolyte secondary cell in one embodiment is a secondary particle obtained by aggregating primary particles. Ion chromatography analysis of a sample obtained by adding the positive electrode active material to an alkali solution and absorbing a distillate thereof in sulfuric acid results in detection of 2-200 pm of ammonia relative to the mass of the positive electrode active material. When a filtrate of an aqueous dispersion in which 1 g of the positive electrode active material is dispersed in 70 ml of pure water is titrated with hydrochloric acid, the value of Y−X is 50-300 mol/g and the value of X−(Y−X) is no higher than 150 mol/g, with X mol/g being the acid consumption until a first inflection point on the pH curve and Y mol/g being the acid consumption until a second inflection point.

## Claims

### Claim 1

A positive electrode active material of a non-aqueous electrolyte secondary battery, comprising a lithium-containing transition metal composite oxide,
wherein the lithium-containing transition metal composite oxide is secondary particles formed by aggregation of primary particles,
when the positive electrode active material is added to an alkaline solution and then distilled, and the distillate is absorbed by sulfuric acid and subjected to ion chromatographic analysis, ammonia is detected in an amount of 2 to 200 ppm relative to the positive electrode active material, and
when a filtrate of an aqueous dispersion prepared by dispersing 1 g of the positive electrode active material in 70 ml of pure water is titrated with hydrochloric acid, and an acid consumption up to a first inflection point of a pH curve is defined as X mol/g and an acid consumption up to a second inflection point is defined as Y mol/g, a value of Y−X is 50 to 300 mol/g and a value of X−(Y−X) is 150 mol/g or less.

### Claim 2 (depends on 1)

The positive electrode active material of a non-aqueous electrolyte secondary battery according to claim 1,
wherein at least one selected from a zirconium compound, a tungsten compound, a phosphorus compound, a boron compound, and a rare earth compound is attached to a surface of the primary particles.

### Claim 3 (depends on 1)

The positive electrode active material of a non-aqueous electrolyte secondary battery according to claim 1,
wherein the lithium-containing transition metal composite oxide contains nickel in an amount of 80% or more relative to a total number of moles of metal elements excluding lithium.

### Claim 4 (depends on 1)

A positive electrode for a non-aqueous electrolyte secondary battery, comprising a positive electrode mixture layer comprising the positive electrode active material according to claim 1.

### Claim 5 (depends on 4)

A non-aqueous electrolyte secondary battery, comprising:
the positive electrode for a non-aqueous electrolyte secondary battery according to claim 4;
a negative electrode;
a separator; and
a non-aqueous electrolyte.

### Claim 6 (depends on 1)

The positive electrode active material of a non-aqueous electrolyte secondary battery according to claim 1,
wherein the lithium-containing transition metal composite oxide contains nickel in an amount of greater than or equal to 91% and less than or equal to 95% relative to a total number of moles of metal elements excluding lithium.