# US 12,113,222 B2 · Method for producing cathode material and cathode including cathode material produced thereby

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- Number: US 12,113,222 B2
- Document ID: US12113222B2
- Status: Granted
- Kind: B2
- Application number: 17/477,904
- Filed: 2021-09-17
- Published: 2022-04-07
- Granted: 2024-10-08
- Earliest claimed: 2020-10-05
- Assignees: Hyundai Motor Company; Kia Corporation
- Applicants: Hyundai Motor Company; Kia Corporation
- Inventors: Yong Sub Yoon; Hong Seok Min; Hajime Tsuchiya; Yuki Sasaki
- Web page: https://patentgrep.com/patent/US12113222B2

## CPC

- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/628: {Inhibitors, e.g. gassing inhibitors, corrosion inhibitors}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/366: {as layered products}
- 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 10/0562: Solid materials
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

The present disclosure relates to a method for producing a cathode material and a cathode including a cathode material produced thereby. More specifically, the present disclosure provides a production method which improves process efficiency while improving cathode performance in consideration of the practical use of an all-solid-state battery in the production of a cathode for the all-solid-state battery.

## Claims

### Claim 1

A method for producing a cathode material, the method comprising steps of:
preparing a coating solution by adding, mixing, and dissolving a coating material comprising lithium (Li) and niobium (Nb) in a solvent containing water (H2O);
forming a coating layer by spraying the coating solution onto surfaces of lithium oxide-based particles; and
heat-treating the coating layer;
wherein preparing the coating solution comprises:
an addition step of adding the coating material to the solvent containing water;
a dissolution step of dissolving the coating material in the solvent to obtain a solution; and
a neutralization step of neutralizing the solution by adding hydroxide thereto;
wherein the solvent further contains an adjuvant, and the adjuvant comprises a surfactant;
wherein the surfactant comprises at least one of an anionic surfactant and a nonionic surfactant; and
wherein the adjuvant is contained in an amount of 0.001 to 0.30 parts by weight based on 100 parts by weight of the solvent.

### Claim 2 (depends on 1)

The method of claim 1, wherein the coating solution contains lithium at a concentration of 1 M to 10 M and niobium at a concentration of 1 M to 10 M.

### Claim 3 (depends on 1)

The method of claim 1, wherein a molar ratio between lithium and niobium contained in the coating solution is Li/Nb=0.9 to 1.2.

### Claim 4 (depends on 1)

The method of claim 1, wherein the coating solution in the step of forming the coating layer is sprayed and attached onto the surfaces of the lithium oxide-based particles by a spray coating method.

### Claim 5 (depends on 1)

The method of claim 1, wherein the heat-treatment in the step of heat-treating the coating layer is performed at a temperature of 300° C. to 450° C.

### Claim 6 (depends on 1)

The method of claim 1, wherein the pH in the addition step is 3 or less, the pH in the dissolution step is 3 to 12, and the pH in the neutralization step is 6 to 8.

### Claim 7 (depends on 1)

The method of claim 1, wherein the adjuvant further comprises ammonia (NH3).

### Claim 8 (depends on 7)

The method of claim 7, wherein hydrogen peroxide (H2O2) together with the coating material is added in the addition step to create a weakly acidic environment, ammonia (NH3) is added to the solvent in the dissolution step to create a strongly alkaline environment, and the coating material is dissolved in the solvent in the strongly alkaline environment.

### Claim 9 (depends on 8)

The method of claim 8, wherein the coating material that is added has a solubility that changes depending on a hydrogen ion concentration (pH) environment of the solvent, and the pH of the solvent is adjusted using the hydrogen peroxide, ammonia and hydroxide that are added.