# US 12,002,954 B2 · Positive electrode active material for non-Aqueous electrolyte secondary battery, non-Aqueous electrolyte secondary battery, and method for producing positive electrode active material for non-aqueous electrolyte secondary battery

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- Number: US 12,002,954 B2
- Document ID: US12002954B2
- Status: Granted
- Kind: B2
- Application number: 17/275,355
- Filed: 2019-09-19
- Published: 2022-02-17
- Granted: 2024-06-04
- Earliest claimed: 2018-09-28
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Noriko Fukamichi; Toshinobu Kanai; Takeshi Ogasawara
- Web page: https://patentgrep.com/patent/US12002954B2

## 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 51/40: Complex oxides containing cobalt and at least one other metal element
- C01G 51/50: of the type (MnO2)n-, e.g. Li(CoxMn1-x)O2 or Li(MyCoxMn1-x-y)O2
- C01G 51/82: Compounds containing cobalt, with or without oxygen or hydrogen, and containing two or more other elements
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- C01P 2002/52: containing elements as dopants
- C01P 2004/50: Agglomerated particles
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/84: one phase coated with the other
- 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

According to one embodiment, a positive electrode active material for a non-aqueous electrolyte secondary battery contains a lithium/transition metal composite oxide that contains 80 mol % or more, relative to the total mol number of metal elements other than Li, of Ni and at least one kind of metal element selected from among Co, Mn, Al, W, Mg, Mo, Nb, Ti, Si and Zr. When a filtrate of a suspension, said suspension being prepared by adding 250 mg of the positive electrode active material to 10 mL of a 17.5 mass % aqueous solution of hydrochloric acid, dissolving by heating at 90° C. for 2 hours and then diluting to 50 mL, is analyzed by inductively coupled plasma mass spectrometry, the elution amount of S in the filtrate is 0.002 mmol or greater.

## Claims

### Claim 1

A method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery, the method including:
a step of oxidizing and roasting a hydroxide containing at least Ni obtained by a crystallization method to provide a composite oxide;
a step of mixing the composite oxide with a lithium compound and firing the mixed particles to provide a lithium transition metal composite oxide; and
a step of washing the lithium transition metal composite oxide with water, thereafter mixing the composite oxide with at least one selected from magnesium sulfate, zirconium sulfate, and cobalt sulfate, and heat-treating the mixture at a temperature of 150 to 280° C.
the lithium transition metal composite oxide containing 80 mol % or more of Ni with respect to the total number of moles of metal elements excluding Li and containing at least one metal element selected from Co, Mn, Al, W, Mg, Mo, Nb, Ti, Si, and Zr,
wherein when 250 mg of the positive electrode active material is added to 10 mL of a 17.5% by mass hydrochloric acid aqueous solution, heated and dissolved at 90° C. for 2 hours and then diluted to 50 mL, an amount of S dissolved in the diluted filtrate of the suspension is 0.002 mmol or more as determined by inductively coupled plasma mass spectrometry.

### Claim 2 (depends on 1)

The method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1, wherein the lithium transition metal composite oxide contains at least one selected from Co, Al, and Mn, and an amount of a metal element M (at least one metal element selected from W, Mg, Mo, Nb, Ti, Si, and Zr) dissolved in the filtrate is 0.0001 mmol or more.

### Claim 3 (depends on 1)

The method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 1, wherein at least one of tungsten trioxide and lithium tungstate is fixed on a surface of particles of the lithium transition metal composite oxide.

### Claim 4 (depends on 1)

A non-aqueous electrolyte secondary battery, comprising:
a positive electrode including the positive electrode active material produced by the method according to claim 1;
a negative electrode; and
a non-aqueous electrolyte.

### Claim 5

A method for producing the positive electrode active material for a non-aqueous electrolyte secondary battery, the method including:
a step of oxidizing and roasting a hydroxide containing at least Ni obtained by a crystallization method to provide a composite oxide;
a step of mixing the composite oxide with a lithium compound and firing the mixed particles to provide a lithium transition metal composite oxide; and
a step of washing the lithium transition metal composite oxide with water, thereafter mixing the composite oxide with at least one selected from magnesium sulfate, zirconium sulfate, and cobalt sulfate, and heat-treating the mixture under a vacuum condition at a temperature of 150 to 280° C.,
the lithium transition metal composite oxide containing 80 mol % or more of Ni with respect to the total number of moles of metal elements excluding Li and containing at least one metal element selected from Co, Mn, Al, W, Mg, Mo, Nb, Ti, Si, and Zr,
wherein when 250 mg of the positive electrode active material is added to 10 mL of a 17.5% by mass hydrochloric acid aqueous solution, heated and dissolved at 90° C. for 2 hours and then diluted to 50 mL, an amount of S dissolved in the diluted filtrate of the suspension is 0.002 mmol or more as determined by inductively coupled plasma mass spectrometry.

### Claim 6 (depends on 5)

The method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 5, wherein the lithium transition metal composite oxide contains at least one selected from Co, Al, and Mn, and an amount of a metal element M (at least one metal element selected from W, Mg, Mo, Nb, Ti, Si, and Zr) dissolved in the filtrate is 0.0001 mmol or more.

### Claim 7 (depends on 5)

The method for producing a positive electrode active material for a non-aqueous electrolyte secondary battery according to claim 5, wherein at least one of tungsten trioxide and lithium tungstate is fixed on a surface of particles of the lithium transition metal composite oxide.

### Claim 8 (depends on 5)

A non-aqueous electrolyte secondary battery, comprising:
a positive electrode including the positive electrode active material produced by the method according to claim 5;
a negative electrode; and
a non-aqueous electrolyte.