# US 12,603,282 B2 · Cathode slurry composition, cathode for secondary battery and lithium secondary battery

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- Number: US 12,603,282 B2
- Document ID: US12603282B2
- Status: Granted
- Kind: B2
- Application number: 18/509,427
- Filed: 2023-11-15
- Published: 2024-05-30
- Granted: 2026-04-14
- Earliest claimed: 2022-11-29
- Assignees: SK On Co., Ltd.
- Applicants: SK On Co., Ltd.
- Inventors: Byoung Ho Ko
- Web page: https://patentgrep.com/patent/US12603282B2

## CPC

- H01M 4/5825: {Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines}
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/136: Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
- H01M 4/622: {being polymers}
- H01M 4/625: {Carbon or graphite}
- H01M 10/052: Li-accumulators
- 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

A cathode slurry composition according to an aspect includes a cathode active material, an acrylic dispersant, and a solvent. The cathode slurry composition has a solids content of 65% by weight or more, and a shear viscosity value of 150 Pa·s or less measured at a temperature of 25° C. and a shear rate of 1/s. According to the aspect, a cathode slurry composition having excellent dispersibility, flowability, and the like, as aggregation between active cathode material particles is suppressed, and having a relatively high solids content and low shear viscosity may be provided. According to the cathode slurry composition, a cathode for a secondary battery may be formed having excellent processability without limitations on electrode loading design, coating speed setting, and the like.

## Claims

### Claim 1

A cathode slurry composition comprising:
a cathode active material, an acrylic dispersant, and a solvent,
wherein the acrylic dispersant has a number average molecular weight (Mn) of 10,000 to 50,000,
wherein, in the cathode slurry composition,
a solids content is 65% by weight or more,
a shear viscosity value measured at a temperature of 25° C. and a shear rate of 1/s is 150 Pa·s or less, and
wherein an RPA value according to Equation 1 below is 1.2 or less,
RPA=|(PA0−PA1)|/PA0 [Equation 1]
in Equation 1, RPA is a change rate in a phase angle before and after shearing of a slurry, PA0 is a phase angle (°) of a slurry before shearing, and PA1 is a phase angle (°) of a slurry after shearing.

### Claim 2 (depends on 1)

The cathode slurry composition of claim 1, wherein the acrylic dispersant comprises a polyacrylate-based compound.

### Claim 3 (depends on 1)

The cathode slurry composition of claim 1, wherein the acrylic dispersant is included in an amount of 0.1 to 10% by weight based on a solids content.

### Claim 4 (depends on 1)

The cathode slurry composition of claim 1, wherein the cathode active material has an average particle diameter (D50) of less than 5 μm.

### Claim 5 (depends on 1)

The cathode slurry composition of claim 1, wherein the cathode active material comprises a lithium iron phosphate-based (LFP) active material.

### Claim 6 (depends on 1)

The cathode slurry composition of claim 1, further comprising:
a conductive material dispersion.

### Claim 7 (depends on 6)

The cathode slurry composition of claim 6, wherein the conductive material dispersion comprises an additional acrylic dispersant.

### Claim 8 (depends on 1)

A cathode for a secondary battery, wherein the cathode slurry for a secondary battery is formed of the cathode slurry composition according to claim 1.

### Claim 9 (depends on 8)

The cathode for a secondary battery of claim 8, wherein an electrode adhesion value is greater than 0.30 N/18 mm.

### Claim 10 (depends on 8)

The cathode for a secondary battery of claim 8, wherein an electrode resistance value is less than 10.0Ω·cm.

### Claim 11 (depends on 8)

A lithium secondary battery, comprising:
the cathode for a secondary battery according to claim 8.