# US 2020/0403238 A1 · Cathode active material for non-aqueous electrolyte secondary battery and method of manufacturing cathode active material for non-aqueous electrolyte secondary battery

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- Number: US 2020/0403238 A1
- Document ID: US20200403238A1
- Status: Published application
- Kind: A1
- Application number: 16/764,976
- Filed: 2018-11-21
- Published: 2020-12-24
- Earliest claimed: 2017-11-21
- Assignees: Sumitomo Metal Mining Co., Ltd.
- Applicants: Sumitomo Metal Mining Co., Ltd.
- Inventors: Toshiaki AIHARA; Hiroyuki TOYA
- Web page: https://patentgrep.com/patent/US20200403238A1

## CPC

- C01G 53/42: containing alkali metals, e.g. LiNiO2
- 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 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- 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 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/523: {for non-aqueous cells (H01M4/525 takes precedence)}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2004/84: one phase coated with the other
- H01M 2004/028: {Positive electrodes}
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- 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

## Abstract

A cathode active material for a non-aqueous electrolyte secondary battery including primary particles of a lithium nickel complex oxide represented by a general formula: LizNi1−x−yCoxMyO2+α, and secondary particles in which the primary particles aggregate, wherein a plurality of coated lithium nickel complex oxide particles are formed by disposing a compound containing tungsten and lithium on surfaces of the secondary particles and surfaces of the primary particles positioned inside the secondary particles, and wherein a relative standard deviation of a ratio of a number of atoms of tungsten to a number of atoms of a metallic component other than lithium contained in the coated lithium nickel complex oxide particles is 0.4 or lower.

## Claims

### Claim 1

A cathode active material for a non-aqueous electrolyte secondary battery comprising:
primary particles of a lithium nickel complex oxide represented by a general formula: LizNi1−x−yCoxMyO2+α (where 0<x≤0.35, 0≤y≤0.35, 0.95≤z≤1.20, −0.2≤α≤0.2, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al); and
secondary particles in which the primary particles aggregate,
wherein a plurality of coated lithium nickel complex oxide particles are formed by disposing a compound containing tungsten and lithium on surfaces of the secondary particles and surfaces of the inside primary particles, and
wherein a relative standard deviation of a ratio of a number of atoms of tungsten to a number of atoms of a metallic component other than lithium contained in the coated lithium nickel complex oxide particles is 0.4 or lower.

### Claim 2 (depends on 1)

The cathode active material for the non-aqueous electrolyte secondary battery according to claim 1,
wherein the ratio of the number of atoms of tungsten to the number of atoms of the metallic component other than lithium in the coated lithium nickel complex oxide particles is 0.01% or higher and 3.0% or lower.

### Claim 3

A method of manufacturing a cathode active material for a non-aqueous electrolyte secondary battery, the method comprising:
a mixing process of mixing lithium nickel complex oxide particles, tungsten trioxide, and water to obtain tungsten mixture, the lithium nickel complex oxide particles including primary particles of a lithium nickel complex oxide represented by a general formula: LizNi1−x−yCoxMyO2+α (where 0<x≤0.35, 0≤y≤0.35, 0.95≤z≤1.20, −0.2≤α≤0.2, and M is at least one element selected from Mn, V, Mg, Mo, Nb, Ti, and Al), and secondary particles in which the primary particles aggregate; and
a heat treatment process of heat-treating the tungsten mixture,
wherein the tungsten trioxide has a ratio of IWO2.90/IWO3.00 equal to or lower than 0.15, where IWO2.90 is a peak intensity of a (200) plane of WO2.90 and IWO3.00 is a peak intensity of a (200) plane of WO3.00 in an XRD pattern.

### Claim 4 (depends on 3)

The method of manufacturing the cathode active material for the non-aqueous electrolyte secondary battery according to claim 3,
wherein a cumulative 10% particle diameter is 10 μm or more, a cumulative 50% particle diameter is 30 μm or more and 55 μm or less, and a cumulative 90% particle diameter is 100 μm or less.

### Claim 5 (depends on 3)

The method of manufacturing the cathode active material for the non-aqueous electrolyte secondary battery according to claim 3,
wherein a specific surface area of tungsten trioxide is 0.5 m2/g or more and 7.0 m2/g or less.