# US 2021/0242499 A1 · Non-aqueous electrolyte power storage device and method for manufacturing non-aqueous electrolytic power storage device

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- Number: US 2021/0242499 A1
- Document ID: US20210242499A1
- Status: Published application
- Kind: A1
- Application number: 17/098,755
- Filed: 2020-11-16
- Published: 2021-08-05
- Earliest claimed: 2020-01-31
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Kento HOSOE; Shinsuke MATSUHARA
- Web page: https://patentgrep.com/patent/US20210242499A1

## CPC

- H01M 4/622: {being polymers}
- H01M 10/0568: characterised by the solutes
- H01G 11/06: with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC]
- H01G 11/50: specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation
- H01M 4/0404: {by coating on electrode collectors}
- H01M 4/0416: {involving impregnation with a solution, dispersion, paste or dry powder (H01M4/0438 takes precedence)}
- H01M 4/139: Processes of manufacture
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- H01G 11/38: Carbon pastes or blends; Binders or additives therein
- H01M 2004/021: {Physical characteristics, e.g. porosity, surface area}
- Y02E 60/10: Energy storage using batteries
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01G: CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE (selection of specified materials as dielectric H01B3/00; capacitors having potential barriers H10D1/62, H10K10/10)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A method for manufacturing a non-aqueous electrolytic power storage device includes preparing a mixture paste in which an active material particle, a binder, and carboxymethylcellulose are mixed in an aqueous solvent, applying the mixture paste to a current collector, and drying the applied mixture paste. Here, a proportion of carboxymethylcellulose having an etherification degree of 40 mol/C6 or less is 0.5 wt % or more in terms of a solid content fraction in the mixture paste.

## Claims

### Claim 1

A method for manufacturing a non-aqueous electrolytic power storage device, the method comprising:
preparing a mixture paste in which an active material particle, a binder, and carboxymethylcellulose are mixed in an aqueous solvent;
applying the mixture paste to a current collector; and
drying the mixture paste that is applied to the current collector,
wherein a proportion of carboxymethylcellulose having an etherification degree of 40 mol/C6 or less is 0.5 wt % or more in terms of a solid content fraction in the mixture paste.

### Claim 2 (depends on 1)

The method for manufacturing the non-aqueous electrolytic power storage device according to claim 1, wherein the proportion of carboxymethylcellulose having the etherification degree of 40 mol/C6 or less is 15 wt % or less in terms of the solid content fraction in the mixture paste.

### Claim 3 (depends on 1)

The method for manufacturing the non-aqueous electrolyte power storage device according to claim 1, wherein the preparing of the mixture paste includes preparing the mixture paste in which the active material particle and the binder are mixed in the aqueous solvent, and then mixing carboxymethylcellulose having the etherification degree of 40 mol/C6 or less into the mixture paste.

### Claim 4

Anon-aqueous electrolytic power storage device comprising an active material layer that contains carboxymethylcellulose having an etherification degree of 40 mol/C6 or less and has pores of 4 μm or more and 106 μm or less per unit area, the pores having 25% or more of a total pore volume.

### Claim 5 (depends on 4)

The non-aqueous electrolytic power storage device according to claim 4, wherein a proportion of carboxymethylcellulose having the etherification degree of 40 mol/C6 or less, contained in the active material layer is 0.5 wt % or more.

### Claim 6 (depends on 4)

The non-aqueous electrolytic power storage device according to claim 4, wherein a proportion of carboxymethylcellulose having the etherification degree of 40 mol/C6 or less, contained in the active material layer is 2 wt % or less.

### Claim 7 (depends on 4)

The non-aqueous electrolytic power storage device according to claim 4, wherein a proportion of carboxymethylcellulose having the etherification degree of 40 mol/C6 or less in the carboxymethylcellulose contained in the active material layer is 50% or more.