# US 12,603,278 B2 · Cathode active material, method for manufacturing the same, and secondary lithium ion battery including the same

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- Number: US 12,603,278 B2
- Document ID: US12603278B2
- Status: Granted
- Kind: B2
- Application number: 17/787,191
- Filed: 2020-12-18
- Published: 2023-02-09
- Granted: 2026-04-14
- Earliest claimed: 2019-12-19
- Assignees: Posco; Research Institute of Industrial Science & Technology; Posco Chemical Co., Ltd
- Applicants: Posco; Research Institute of Industrial Science & Technology; Posco Chemical Co., Ltd
- Inventors: Kwon Young Choi; Sang Cheol Nam; Sang Hyuk Lee; Inchul Park; Jong Il Park; Jung Hoon Song; Ohmin Kwon
- Web page: https://patentgrep.com/patent/US12603278B2

## CPC

- C01G 53/82: Compounds containing nickel, with or without oxygen or hydrogen, and containing two or more other elements
- H01M 4/366: {as layered products}
- 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
- H01M 4/0416: {involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence)}
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/1391: of 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 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- C01P 2002/78: by stacking-plane distances or stacking sequences
- C01P 2002/85: by XPS, EDX or EDAX data
- C01P 2004/04: obtained by TEM, STEM, STM or AFM
- C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer
- C01P 2004/84: one phase coated with the other
- 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
- 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

Embodiments of the present invention relate to a cathode active material, a method for manufacturing the same, and a lithium secondary battery including the same. According to an embodiment, a cathode active material can be provided, the cathode active material comprising: a lithium metal oxide including a core and a shell disposed on a surface of the core; and a coating layer disposed on a surface of the lithium metal oxide, wherein a c value that satisfies Equation 1 and is in a range of 0.3 to 0.7, and the core and the shell have a layered crystalline structure. c=b/a [Equation 1] (in Equation 1, a is a peak at 530 to 533 eV and b is a peak at 528 to 531 eV in an XPS spectrum of the coating layer).

## Claims

### Claim 1

A cathode active material, comprising:
a lithium metal oxide including a core and a shell disposed on a surface of the core; and
a coating layer disposed on a surface of the lithium metal oxide,
wherein a c value that satisfies Equation 1 and is in a range of 0.3 to 0.7, wherein:
a d-spacing value of a crystalline structure in the coating layer is in a range of 0.24 to 0.43 nm, wherein the coating layer includes Mn, and
the core and the shell have a layered crystalline structure,
c=b/a [Equation 1]
(in Equation 1, a is a peak at 530 to 533 eV and b is a peak at 528 to 531 eV in an XPS spectrum of the coating layer).

### Claim 2 (depends on 1)

The cathode active material of claim 1, wherein:
a d-spacing value of a crystalline structure in the coating layer is smaller than a d-spacing value of a crystalline structure in the lithium metal oxide.

### Claim 3 (depends on 1)

The cathode active material of claim 1, wherein:
a d-spacing value of a crystal structure of the lithium metal oxide is in a range of 0.465 to 0.480 nm.

### Claim 4 (depends on 1)

The cathode active material of claim 1, wherein:
the coating layer includes at least one of the layered crystalline structure and a spinel crystalline structure.

### Claim 5 (depends on 1)

The cathode active material of claim 1, wherein:
a content of Mn contained in the coating layer is 0.15 to 0.45 mol % based on the total cathode active material.

### Claim 6 (depends on 1)

The cathode active material of claim 1, wherein:
a content of nickel in metal in the lithium metal oxide is 80 mol % or more.

### Claim 7 (depends on 1)

A lithium secondary battery, comprising:
a cathode containing the cathode active material of claim 1;
an anode containing an anode active material; and
an electrolyte disposed between the cathode and the anode.