# US 10,320,002 B2 · Method for manufacturing electrode sheet and electrode sheet

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- Number: US 10,320,002 B2
- Document ID: US10320002B2
- Status: Granted
- Kind: B2
- Application number: 15/186,639
- Filed: 2016-06-20
- Published: 2017-01-19
- Granted: 2019-06-11
- Earliest claimed: 2015-07-13
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Hiroya Umeyama; Tatsuya Hashimoto; Yusuke Fukumoto; Naoto Onodera; Koichi Toriyama
- Web page: https://patentgrep.com/patent/US10320002B2

## CPC

- H01M 4/622: {being polymers}
- H01M 4/0433: {Molding}
- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/134: Electrodes based on metals, Si or alloys
- H01M 4/366: {as layered products}
- H01M 4/70: characterised by shape or form
- H01M 4/583: Carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 10/052: Li-accumulators
- 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 method for manufacturing an electrode sheet includes the steps of forming a granulated material containing a plurality of granules; forming an electrode mixture layer by molding the granulated material into a sheet; and placing the electrode mixture layer on electrode current collector foil. The step of forming the granulated material includes the steps of forming a granule containing at least an electrode active material and a binder; and adhering a polyglycerol fatty acid ester to a surface of the granule.

## Claims

### Claim 1

A method for manufacturing an electrode sheet comprising the steps of:
forming a granulated material comprising a plurality of granules;
forming an electrode mixture layer by molding the granulated material into a sheet; and
placing the electrode mixture layer on electrode current collector foil,
the step of forming the granulated material comprising the steps of:
forming granules comprising at least an electrode active material and a binder;
adding a polyglycerol fatty acid ester to the granules, and
adhering the polyglycerol fatty acid ester to a surface of the granules to form the granulated material.

### Claim 2 (depends on 1)

The method for manufacturing an electrode sheet according to claim 1, wherein the binder contains a carboxymethylcellulose-based polymer.

### Claim 3 (depends on 2)

The method for manufacturing an electrode sheet according to claim 2, wherein
the granulated material has a content of the carboxymethylcellulose-based polymer not less than 0.2 mass % and not more than 1.2 mass %, a content of the polyglycerol fatty acid ester not less than 0.1 mass % and not more than 0.3 mass %, and
a total content of the carboxymethylcellulose-based polymer and the polyglycerol fatty acid ester not more than 1.4 mass %.

### Claim 4 (depends on 1)

An electrode sheet obtained by the method according to claim 1, the electrode sheet comprising:
the electrode current collector foil; and
the electrode mixture layer placed on the electrode current collector foil,
wherein the electrode mixture layer comprises the plurality of granules,
the granules comprise at least the electrode active material and the binder, and
the granules have a layer of the polyglycerol fatty acid ester adhered to a surface thereof.

### Claim 5 (depends on 4)

The electrode sheet according to claim 4, wherein the layer of the polyglycerol fatty acid ester adhered to the surface of the granules consists essentially of the polyglycerol fatty acid ester.

### Claim 6 (depends on 4)

The electrode sheet according to claim 4, wherein the layer of the polyglycerol fatty acid ester adhered to the surface of the granules consists of the polyglycerol fatty acid ester.