# US 2026/0100376 A1 · Electrode mixture sheet, electrode, secondary battery, and method for producing electrode mixture sheet

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- Number: US 2026/0100376 A1
- Document ID: US20260100376A1
- Status: Published application
- Kind: A1
- Application number: 19/415,916
- Filed: 2025-12-11
- Published: 2026-04-09
- Earliest claimed: 2023-06-13
- Assignees: Daikin Industries, Ltd.
- Applicants: Daikin Industries, Ltd.
- Inventors: Nozomi KIKUCHI; Takaya YAMADA; Yuta ISHINO; Masato TOKUDA
- Web page: https://patentgrep.com/patent/US20260100376A1

## CPC

- H01M 4/131: Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/623: {fluorinated polymers}
- H01M 4/13: Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M 4/1391: of electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
- H01M 4/625: {Carbon or graphite}
- H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
- 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

An electrode mixture sheet having high tensile strength and low resistance, an electrode and a secondary battery each including the electrode mixture sheet, and a method of producing an electrode mixture sheet. An electrode mixture sheet including: a polytetrafluoroethylene; a carbon material; and an electrode active material other than the carbon material and/or a fluororesin other than the polytetrafluoroethylene, the electrode mixture sheet having a value X of 2300 or less, where the value X is expressed as interface length/amount of detected carbon in an image of carbon composition distribution in a 2000× field of view obtained by SEM-EDX analysis.

## Claims

### Claim 1

An electrode mixture sheet comprising: a polytetrafluoroethylene;
a carbon material; and
an electrode active material other than the carbon material and/or a fluororesin other than the polytetrafluoroethylene,
the electrode mixture sheet having a value X of 2300 or less, where the value X is expressed as interface length/amount of detected carbon in an image of carbon composition distribution in a 2000× field of view obtained by SEM-EDX analysis, and
the amount of the polytetrafluoroethylene being 0.1% by mass or more relative to the electrode mixture sheet.

### Claim 2 (depends on 1)

The electrode mixture sheet according to claim 1,
wherein the value X is 300 or more and 2000 or less.

### Claim 3 (depends on 1)

The electrode mixture sheet according to claim 1,
wherein a total amount of the polytetrafluoroethylene and the fluororesin other than the polytetrafluoroethylene is 0.1% by mass or more and 10% by mass or less relative to the electrode mixture sheet.

### Claim 4 (depends on 1)

The electrode mixture sheet according to claim 1,
wherein the carbon material is a conductive aid.

### Claim 5 (depends on 1)

The electrode mixture sheet according to claim 1,
wherein the electrode active material other than the carbon material is a positive electrode active material.

### Claim 6 (depends on 5)

The electrode mixture sheet according to claim 5,
wherein an amount of the positive electrode active material is 92% or more and 99% by mass or less relative to the electrode mixture sheet.

### Claim 7 (depends on 1)

An electrode comprising the electrode mixture sheet according to claim 1.

### Claim 8 (depends on 7)

A secondary battery comprising the electrode according to claim 7.

### Claim 9 (depends on 1)

A method of producing an electrode mixture sheet according to claim 1, comprising:
(1) mixing a polytetrafluoroethylene with an electrode active material other than a carbon material and/or a fluororesin other than the polytetrafluoroethylene; and
(2) mixing the mixture obtained in the step (1) with a carbon material,
wherein all the components mixed in the step (1) are powder, and the step (1) is performed in the absence of a liquid medium.

### Claim 10 (depends on 9)

The production method according to claim 9,
wherein the step (1) includes producing fibrils of the polytetrafluoroethylene by a shear force.

### Claim 11 (depends on 9)

The production method according to claim 9,
wherein the mixing in the step (2) is performed with a lower shear force than in the step (1).

### Claim 12 (depends on 9)

The production method according to claim 9,
wherein a processing temperature in the step (2) is lower than a processing temperature in the step (1).

### Claim 13 (depends on 9)

The production method according to claim 9,
wherein the step (1) and the step (2) are performed using an identical device.