# US 2022/0285679 A1 · Positive electrode active material for lithium ion secondary battery and lithium ion secondary battery

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- Number: US 2022/0285679 A1
- Document ID: US20220285679A1
- Status: Published application
- Kind: A1
- Application number: 17/637,914
- Filed: 2020-08-28
- Published: 2022-09-08
- Earliest claimed: 2019-08-30
- Assignees: Sumitomo Metal Mining Co., Ltd.
- Applicants: Sumitomo Metal Mining Co., Ltd.
- Inventors: Haruki Kaneda; Yuki Koshika
- Web page: https://patentgrep.com/patent/US20220285679A1

## CPC

- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- C01G 53/42: containing alkali metals, e.g. LiNiO2
- C01G 53/44: containing manganese
- 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2002/52: containing elements as dopants
- C01P 2002/54: one element only
- C01P 2002/74: by peak-intensities or a ratio thereof only
- C01P 2002/76: by a space-group or by other symmetry indications
- C01P 2004/03: obtained by SEM
- C01P 2004/45: Aggregated particles or particles with an intergrown morphology
- C01P 2004/50: Agglomerated particles
- C01P 2004/51: Particles with a specific particle size distribution
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/62: Submicrometer sized, i.e. from 0.1-1 micrometer
- C01P 2006/12: Surface area
- C01P 2006/40: Electric properties
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- 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
- 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)
- 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 positive electrode active material for a lithium ion secondary battery, the positive electrode active material including a lithium-nickel composite oxide having a hexagonal layered structure and configured by particles including at least either single primary particles or secondary particles with a plurality of aggregated primary particles, wherein the particles of the positive electrode active material have a cross section having an area proportion of a crystal face having a maximum area in the particle of 80% or more when one crystal face is defined as a region having a crystal misorientation of 15° or less.

## Claims

### Claim 1

A positive electrode active material for a lithium ion secondary battery, the positive electrode active material comprising a lithium-nickel composite oxide having a hexagonal layered structure and configured by particles including at least either single primary particles or secondary particles with a plurality of aggregated primary particles,
wherein metal elements constituting the lithium-nickel composite oxide include lithium (Li), nickel (Ni), and optionally at least one element M (M) selected from the group consisting of Co, Mn, Al, V, Mg, Mo, Ca, Cr, Zr, Ti, Nb, Na, K, W, Fe, Zn, B, Si, P, and Ta,
a mole number ratio of the metal elements is represented as Li:Ni:M=a:b:c (provided that, 0.95≤a≤1.10, 0.30≤b≤1.00, 0.00≤c≤0.70, and b+c=1), and
the particles included in the positive electrode active material have a cross section having an area proportion of a crystal face having a maximum area to the cross section of 80% or more when one crystal face is defined as a region having a crystal misorientation of 15° or less.

### Claim 2 (depends on 1)

The positive electrode active material for a lithium ion secondary battery according to claim 1, wherein a number proportion of the single primary particles to all of the particles is 30% or more.

### Claim 3 (depends on 1)

The positive electrode active material for a lithium ion secondary battery according to claim 1, wherein a ratio of a (003) diffraction peak intensity I(003) to a (104) diffraction peak intensity I(104) (I(003)/I(104)) is 2.0 or more, the (003) diffraction peak intensity and the (104) diffraction peak intensity determined from X-ray diffraction measured using a flat plate sample holder of a Bragg Brentano optical system using a Cu-kα ray as an X-ray source.

### Claim 4 (depends on 1)

The positive electrode active material for a lithium ion secondary battery according to claim 1, wherein the positive electrode active material has a volume-based median diameter (D50) of 10 μm or less, and the lithium-nickel composite oxide has an average primary particle size of 0.3 μm or more.

### Claim 5 (depends on 1)

The positive electrode active material for a lithium ion secondary battery according to claim 1, wherein the positive electrode active material has a specific surface area of 1.0 m2/g or more and 5.0 m2/g or less, the specific surface area determined with a nitrogen adsorption method.

### Claim 6 (depends on 1)

A lithium ion secondary battery comprising: a positive electrode; a negative electrode; and a non-aqueous electrolyte, the positive electrode containing the positive electrode active material for a lithium ion secondary battery according to claim 1.