# US 2018/0026265 A1 · Positive electrode active substance for non-aqueous electrolyte secondary batteries, 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 2018/0026265 A1
- Document ID: US20180026265A1
- Status: Published application
- Kind: A1
- Application number: 15/550,874
- Filed: 2016-02-15
- Published: 2018-01-25
- Earliest claimed: 2015-02-17
- Applicants: Toda Kogyo Corp.
- Inventors: Akihisa KAJIYAMA; Ryuta MASAKI; Tsuyoshi WAKIYAMA; Tetsuya KASHIMA; Shoichi FUJINO; Osamu SASAKI; Kazutoshi MATSUMOTO
- Web page: https://patentgrep.com/patent/US20180026265A1

## CPC

- C01G 51/44: containing manganese
- C01G 45/1228: of the type (MnO2)-, e.g. LiMnO2 or Li(MxMn1-x)O2
- C01G 53/502: containing lithium and cobalt
- C01G 53/504: with the molar ratio of nickel with respect to all the metals other than alkali metals higher than or equal to 0.5, e.g. Li(MzNixCoyMn1-x-y-z)O2 with x ≥ 0.5
- 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
- C01G 53/84: Hydroxides
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- 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 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
- H01M 2004/028: {Positive electrodes}
- 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

In accordance with the present invention, there are provided positive electrode active substance particles for non-aqueous electrolyte secondary batteries which is excellent in life characteristics of a battery with respect to a repeated charging and discharging performance thereof, as well as a non-aqueous electrolyte secondary battery. The present invention relates to a positive electrode active substance for non-aqueous electrolyte secondary batteries comprising lithium transition metal layered oxide having a composition represented by the formula: Lia(NixCoyMn1-x-y)O2 wherein a is 1.0≦a≦1.15; x is 0<x<1; and y is 0<y<1, in which the positive electrode active substance is in the form of secondary particles formed by aggregating primary particles thereof, and a coefficient of variation of a compositional ratio: Li/Me wherein Me is a sum of Ni, Co and Mn (Me=Ni+Co+Mn) as measured on a section of the secondary particle is not more than 25%.

## Claims

### Claim 1

A positive electrode active substance for non-aqueous electrolyte secondary batteries comprising lithium transition metal layered oxide having a composition represented by the formula:
Lia(NixCoyMn1-x-y)O2
wherein a is 1.0≦a≦1.15; x is 0<x<1; and y is 0<y<1,
in which the positive electrode active substance is in the form of secondary particles formed by aggregating primary particles thereof, and a coefficient of variation of a compositional ratio: Li/Me wherein Me is a sum of Ni, Co and Mn (Me=Ni+Co+Mn) as measured on a section of the secondary particle is not more than 25%.

### Claim 2 (depends on 1)

The positive electrode active substance for non-aqueous electrolyte secondary batteries according to claim 1, wherein an average secondary particle diameter of the active substance is 3.0 to 16 μm.

### Claim 3 (depends on 1)

The positive electrode active substance for non-aqueous electrolyte secondary batteries according to claim 1, wherein an average particle diameter (crystallite size) of primary particles of the active substance is 100 to 600 nm.

### Claim 4 (depends on 1)

A non-aqueous electrolyte secondary battery using the positive electrode active substance for non-aqueous electrolyte secondary batteries as defined in claim 1.

### Claim 5 (depends on 1)

A process for producing the positive electrode active substance for non-aqueous electrolyte secondary batteries as defined in claim 1, comprising the steps of:
obtaining spherical nickel-cobalt-manganese-based composite compound particles as a raw material;
mixing the composite compound particles with lithium hydroxide such that a molar ratio of Li to a sum of Ni, Co and Mn (Li/(Ni+Co+Mn)) is in the range of 1.00 to 1.20 to obtain a mixture thereof;
calcining the thus obtained mixture at a temperature of 600 to 900° C. in an oxygen-containing atmosphere; and
subjecting the calcined product to annealing treatment at a temperature of 500 to 750° C. which is lower than the calcination temperature, without subjecting the calcined product to water-washing treatment.