# US 12,191,480 B2 · Positive electrode active material for secondary battery, and secondary battery

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- Number: US 12,191,480 B2
- Document ID: US12191480B2
- Status: Granted
- Kind: B2
- Application number: 17/604,144
- Filed: 2020-04-24
- Published: 2022-07-07
- Granted: 2025-01-07
- Earliest claimed: 2019-04-26
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Intellectual Property Management Co., Ltd.
- Inventors: Kosuke Kuroda; Hiroshi Kawada; Atsushi Fukui
- Web page: https://patentgrep.com/patent/US12191480B2

## CPC

- H01M 4/364: {as mixtures}
- C01G 53/42: containing alkali metals, e.g. LiNiO2
- C01G 53/502: containing lithium and cobalt
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- 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 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 10/052: Li-accumulators
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2006/40: Electric properties
- 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 secondary battery according to an embodiment contains: a first composite oxide component represented by general formula Liα[LixMnyCozMe(1−x−y−z)]O2 (in the formula, Me is at least one selected from among Ni Fe, Ti, Bi, Nb, W, Mo, and Ta, 0.5<α<0.85, 0.05<x<0.2, 0.4<y<0.75, and 0<z<0.25), and having at least one crystal structure selected from among O2, T2, and O6 structures; and a second composite oxide component represented by general formula LiaMObAc (in the formula, M is at least one selected from among Ni, Co, Mn, Fe, Cu, Ti, Nb, Al, Ga, Bi, Zr, Ce, Y, W, Ta, Sn, Ca, Ba, and Na, A is at least one selected from among F, Cl, and S, 1.3<a<7, 2≤b<5, and 0≤c≤0.3).

## Claims

### Claim 1

A positive electrode active material for secondary battery, comprising:
a first composite oxide component represented by general formula Liα[LixMnyCozMe(1−x−y−z)]O2 where Me is at least one selected from Ni, Fe, Ti, Bi, Nb, W, Mo, and Ta, and 0.5<α<0.85, 0.05<x<0.2, 0.4<y<0.75, 0<z<0.25, and 1−x−y−z≥0 hold true, and having at least one crystal structure selected from O2 structure, T2 structure, and O6 structure; and
a second composite oxide component represented by general formula LiaMObAc where M is at least one selected from Ni, Co, Mn, Fe, Cu, Ti, Nb, Al, Ga, Bi, Zr, Ce, Y, W, Ta, Sn, Ca, Ba, and Na; A includes at least one selected from F and Cl; and 1.3<a<7, 2>b<5, and 0<c>0.3 hold true,
wherein the positive electrode active material includes a composite of the first composite oxide component and the second composite oxide component,
the composite contains, within a single composite particle, a region having the first composite oxide component and a region having a second composite oxide composition.

### Claim 2 (depends on 1)

The positive electrode active material according to claim 1, wherein a content of the second composite oxide component is from 1 to 25% by mass relative to a total mass of the positive electrode active material.

### Claim 3 (depends on 1)

The positive electrode active material according to claim 1, wherein the positive electrode active material consists essentially of the composite of the first composite oxide component and the second composite oxide component.

### Claim 4 (depends on 1)

The positive electrode active material according to claim 1, wherein the positive electrode active material further includes a mixture of first composite oxide particles containing the first composite oxide component and second composite oxide particles containing the second composite oxide component.

### Claim 5 (depends on 1)

The positive electrode active material according to claim 1, wherein the second composite oxide component is a composite oxide represented by general formula Li2NidB1−dO2−cAc where B is at least one selected from Ga, Bi, Y, W, Ta, Sn, Ca, and Ba, and 0.7≤d≤1 holds true, and having a crystal structure belonging to space group Immm.

### Claim 6 (depends on 1)

The positive electrode active material according to claim 1, wherein the second composite oxide component is a composite oxide represented by general formula Li2O⋅βCocMa1−EO1−c⋅γLiFefMa1−fO2−c where Ma is at least one selected from Mn, Al, Ga, Ge, Zn, Zr, Ce, Y, Sn, Si, Ti, and Na, and 0≤β<0.4, 0≤γ<0.6, 0<β+γ, 0.7≤e≤1, and 0.7≤f≤1 hold true, and having a crystal structure belonging to space group Pbca.

### Claim 7 (depends on 1)

The positive electrode active material according to claim 1, wherein the second composite oxide component contains Li2SO4.

### Claim 8 (depends on 1)

A secondary battery comprising a positive electrode containing the positive electrode active material according to claim 1, a negative electrode, and an electrolyte.