# US 12,009,519 B2 · Cathode active material, preparation method thereof, cathode including the same, and secondary battery

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

- Number: US 12,009,519 B2
- Document ID: US12009519B2
- Status: Granted
- Kind: B2
- Application number: 17/482,684
- Filed: 2021-09-23
- Published: 2022-10-20
- Granted: 2024-06-11
- Earliest claimed: 2021-04-20
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Joonhee Kim; Sangbok Ma; Jonghoon Ka
- Web page: https://patentgrep.com/patent/US12009519B2

## 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
- H01M 4/0471: {involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis}
- H01M 4/366: {as layered products}
- H01M 10/0562: Solid materials
- Y02E 60/10: Energy storage using batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A cathode active material includes a compound represented by Formula 1: Lix(Co1−yMy)z(P2O7)4 Formula 1 wherein in Formula 1, 5≤x≤7, 0.01≤y≤0.1, and 4≤z≤6, and M is a Group 3 to 11 element belonging to 5th and 6th periods in the Periodic Table of the elements, or a combination thereof.

## Claims

### Claim 1

A cathode active material comprising a compound
represented by Formulas 2a to 2r:
Lix(Co1−yNby)z(P2O7)4 Formula 2a
wherein in Formula 2a, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yMoy)z(P2O7)4 Formula 2b
wherein in Formula 2b, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yTay)z(P2O7)4 Formula 2c
wherein in Formula 2c, 5.5≤x≤6.5, 0.01≤00.05, and 4.8≤z≤5.2,
Lix(Co1−yWy)z(P2O7)4 Formula 2d
wherein in Formula 2d, 5.5≤x≤6.5, 0.01≤00.05, and 4.8≤z≤5.2,
Lix(Co1−yYy)z(P2O7)4 Formula 2e
wherein in Formula 2e, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yLay)z(P2O7)4 Formula 2f
wherein in Formula 2f, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yZry)z(P2O7)4 Formula 2g
wherein in Formula 2g, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yHfy)z(P2O7)4 Formula 2h
wherein in Formula 2h, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yTCy)z(P2O7)4 Formula 2i
wherein in Formula 2i, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yRey)z(P2O7)4 Formula 2j
wherein in Formula 2j, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yRuy)z(P2O7)4 Formula 2k
wherein in Formula 2k, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yOs)z(P2O7)4 Formula 2l
wherein in Formula 2l, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yRhy)z(P2O7)4 Formula 2m
wherein in Formula 2m, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yIry)z(P2O7)4 Formula 2n
wherein in Formula 2n, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yPdy)z(P2O7)4 Formula 2o
wherein in Formula 2o, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yPty)z(P2O7)4 Formula 2p
wherein in Formula 2p, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2,
Lix(Co1−yAgy)z(P2O7)4 Formula 2q
wherein in Formula 2q, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2, or
Lix(Co1−yAuy)z(P2O7)4 Formula 2r
wherein in Formula 2r, 5.5≤x≤6.5, 0.01≤y≤0.05, and 4.8≤z≤5.2.

### Claim 2 (depends on 1)

The cathode active material of claim 1,
wherein the compound of Formulas 2a-2r has a crystal structure belonging to a triclinic crystal system.

### Claim 3 (depends on 1)

The cathode active material of claim 1,
wherein the compound of Formulas 2a-2r has a crystal structure belonging to a P−1 space group.

### Claim 4 (depends on 1)

The cathode active material of claim 1,
wherein the compound of Formulas 2a-2r has a band gap of about 0.1 electron volt to about 2.0 electron volts.

### Claim 5 (depends on 1)

The cathode active material of claim 1,
wherein the compound of Formulas 2a-2r has an average discharge voltage of 4 volts or more.

### Claim 6 (depends on 1)

The cathode active material of claim 1,
wherein, when analyzed by X-ray diffraction using Cu-Kα radiation, the compound represented by Formulas 2a-2r has a primary peak at a diffraction angle, 2θ, of 28.0°±1.0°, and a secondary peak at a diffraction angle, 2θ, of 33.5°±1.0°.

### Claim 7 (depends on 6)

The cathode active material of claim 6,
wherein a ratio of an intensity of the secondary peak to an intensity of the primary peak, is greater than 0 and equal to or less than about 0.5.

### Claim 8 (depends on 1)

A cathode comprising: a cathode current collector and a cathode active material layer on a surface of the cathode current collector, the cathode active material layer comprising the cathode active material of claim 1.

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 9)

The secondary battery of claim 9,
wherein the secondary battery is a multi-layer ceramic battery or a thin-film battery comprising the cathode active material.

### Claim 11 (depends on 10)

The secondary battery of claim 10,
wherein the multi-layer ceramic battery comprises:
a plurality of cathode layers, at least one of the plurality of the cathode layers comprising the cathode active material;
a plurality of anode layers alternately arranged between the plurality of cathode layers; and
a plurality of solid electrolyte layers alternately arranged between the plurality of cathode layers and the plurality of anode layers.

### Claim 12 (depends on 9)

The secondary battery of claim 9,
wherein the electrolyte comprises an oxide solid electrolyte.

### Claim 13 (depends on 9)

The secondary battery of claim 9,
wherein the anode comprises a lithium metal phosphate oxide, a lithium metal oxide, a metal oxide, or a combination thereof.

### Claim 14 (depends on 10)

The secondary battery of claim 10,
wherein the multi-layer ceramic battery is a sintered product.

### Claim 15 (depends on 1)

A method of preparing a cathode active material of claim 1, the method comprising:
mixing a cobalt precursor, a lithium precursor, a phosphorus precursor, and an M precursor to prepare a precursor mixture; and
heat-treating the precursor mixture to form the cathode active material of claim 1.

### Claim 16 (depends on 15)

The method of claim 15,
wherein the heat-treating of the precursor mixture is performed at about 500° C. to about 1000° C. for about 1 hour to about 48 hours.

### Claim 17 (depends on 15)

The method of claim 15,
wherein the heat-treating comprises heat-treating the precursor mixture in an oxidative atmosphere or in an inert atmosphere.