# US 2014/0151609 A1 · Slurry composition for composite particles for positive electrode and method for producing composite particles for positive electrode

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- Number: US 2014/0151609 A1
- Document ID: US20140151609A1
- Status: Published application
- Kind: A1
- Application number: 14/096,231
- Filed: 2013-12-04
- Published: 2014-06-05
- Earliest claimed: 2012-12-05
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Hiroki OGURO
- Web page: https://patentgrep.com/patent/US20140151609A1

## CPC

- H01M 4/622: {being polymers}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- 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 slurry composition for composite particles for a positive electrode includes a positive electrode active material, a conductive material, a water soluble resin including a monomeric unit containing an acidic functional group, and a granular binder resin. The moisture content is at most 25% by mass, and the viscosity at a shear velocity of 10 s−1 is at most 2000 mPa·s. A method for producing composite particles for a positive electrode of an electrochemical element includes kneading a mixture including a positive electrode active material, a conductive material, and a water soluble resin including a monomeric unit containing an acidic functional group, preparing a slurry composition with a moisture content of at most 25% by mass and a viscosity at a shear velocity of 10 s−1 of at most 2000 mPa·s by adding a granular binder resin and water to the kneaded mixture, and spray drying the slurry composition.

## Claims

### Claim 1

A slurry composition for composite particles for a positive electrode, the slurry composition comprising:
a positive electrode active material, a conductive material, a water soluble resin including a monomeric unit containing an acidic functional group, and a granular binder resin,
a moisture content being at most 25% by mass, and
a viscosity at a shear velocity of 10 s−1 being at most 2000 mPa·s.

### Claim 2 (depends on 1)

The slurry composition for composite particles for a positive electrode according to claim 1, wherein the positive electrode active material is a Li2MnO3—LiNiO2 based solid solution positive electrode active material.

### Claim 3 (depends on 1)

The slurry composition for composite particles for a positive electrode according to claim 1, wherein the water soluble resin including a monomeric unit containing an acidic functional group includes at least one selected from the group consisting of a monomeric unit containing a sulfonic acid group, a monomeric unit containing a carboxyl group, and a monomeric unit containing a phosphoric acid group.

### Claim 4 (depends on 1)

The slurry composition for composite particles for a positive electrode according to claim 1, wherein the granular binder resin includes a monomeric unit of (meth)acrylic acid ester with a carbon number of 6 to 15, an α,β-unsaturated nitrile monomeric unit, and a monomeric unit containing a carboxyl group.

### Claim 5 (depends on 1)

The slurry composition for composite particles for a positive electrode according to claim 1, wherein the granular binder resin includes a monomeric unit of dibasic acid.

### Claim 6

A method for producing composite particles for a positive electrode, comprising:
kneading a mixture including a positive electrode active material, a conductive material, and a water soluble resin including a monomeric unit containing an acidic functional group to obtain a kneaded mixture;
preparing a slurry composition with a moisture content of at most 25% by mass and a viscosity at a shear velocity of 10 s−1 of at most 2000 mPa·s by adding a granular binder resin and water to the kneaded mixture; and
spray drying the slurry composition to obtain composite particles.

### Claim 7 (depends on 6)

The method for producing composite particles for a positive electrode according to claim 6, wherein during the kneading step, the mixture is kneaded by applying an energy of 50 MJ/m3 to 200 MJ/m3.