# US 2020/0403241 A1 · Li-Ni COMPOSITE OXIDE PARTICLES AND NON-AQUEOUS ELECTROLYTE SECONDARY BATTERY

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2020/0403241 A1
- Document ID: US20200403241A1
- Status: Published application
- Kind: A1
- Application number: 16/975,280
- Filed: 2019-03-01
- Published: 2020-12-24
- Earliest claimed: 2018-03-02
- Assignees: Toda Kogyo Corporation
- Applicants: Toda Kogyo Corp.
- Inventors: Hiroyasu WATANABE; Xiang SUN; Mitchell FETTERER
- Web page: https://patentgrep.com/patent/US20200403241A1

## CPC

- 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
- C01G 53/42: containing alkali metals, e.g. LiNiO2
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/366: {as layered products}
- 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
- C01P 2002/20: Two-dimensional structures
- C01P 2002/52: containing elements as dopants
- C01P 2002/54: one element only
- C01P 2002/72: by d-values or two theta-values, e.g. as X-ray diagram
- C01P 2002/77: by unit-cell parameters, atom positions or structure diagrams
- C01P 2004/45: Aggregated particles or particles with an intergrown morphology
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/84: one phase coated with the other
- C01P 2004/86: Thin layer coatings, i.e. the coating thickness being less than 0.1 time the particle radius
- C01P 2006/12: Surface area
- C01P 2006/40: Electric properties
- C01P 2006/60: Optical properties, e.g. expressed in CIELAB-values
- 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

The present invention provides positive electrode active substance particles comprising a lithium nickelate composite oxide which have a high energy density and are excellent in repeated charge/discharge cycle characteristics when charging at a high voltage, as well as a non-aqueous electrolyte secondary battery. The present invention relates to positive electrode active substance particles each comprising a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula: Li1+aNi1-b-cCobMcO2 wherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr, a is a number of −0.1 to 0.2 (−0.1·a·0.2), b is a number of 0.05 to 0.5 (0.05·b·0.5) and c is a number of 0.01 to 0.4 (0.01·c·0.4); and a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si and having an average film thickness of 0.2 to 5 nm, in which a crystal phase having a layered rock salt structure and comprising Ni2+ ions is present in the form of a layer between the core particle X and the coating compound Y.

## Claims

### Claim 1

Positive electrode active substance particles each comprising:
a core particle X comprising a lithium nickelate composite oxide having a layer structure which is represented by the formula:
Li1+aNi1-b-cCobMcO2
wherein M is at least one element selected from the group consisting of Mn, Al, B, Mg, Ti, Sn, Zn and Zr; a is a number of −0.1 to 0.2 (−0.1·a·0.2); b is a number of 0.05 to 0.5 (0.05·b·0.5); and c is a number of 0.01 to 0.4 (0.01·c·0.4); and
a coating compound Y comprising at least one element selected from the group consisting of Al, Mg, Zr, Ti and Si and having an average film thickness of 0.2 to 5 nm,
in which a crystal phase having a layered rock salt structure and comprising Ni2+ ions is present in the form of a layer between the core particle X and the coating compound Y.

### Claim 2 (depends on 1)

The positive electrode active substance particles according to claim 1, wherein an average valence of Ni in the positive electrode active substance particles is 2.80 to 3.10.

### Claim 3 (depends on 1)

The positive electrode active substance particles according to claim 1, wherein a content of lithium hydroxide LiOH in the positive electrode active substance particles is not more than 0.50% by weight, a content of lithium carbonate Li2CO3 in the positive electrode active substance particles is not more than 0.65% by weight, and a weight ratio of the content of the lithium carbonate to the content of the lithium hydroxide is not less than 0.9.

### Claim 4 (depends on 1)

The positive electrode active substance particles according to claim 1, wherein the positive electrode active substance particles have a BET specific surface area of 0.05 to 0.70 m2/g, a median diameter D50 of aggregated particles of 1 to 30 μm, and a 2% powder pH value of not more than 11.6.

### Claim 5 (depends on 1)

A non-aqueous electrolyte secondary battery comprising a positive electrode active substance that at least partially comprises the positive electrode active substance particles as claimed in claim 1.