# US 12,603,286 B2 · Conductive material paste for all-solid-state secondary battery electrode

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- Number: US 12,603,286 B2
- Document ID: US12603286B2
- Status: Granted
- Kind: B2
- Application number: 17/413,952
- Filed: 2019-12-05
- Published: 2022-02-10
- Granted: 2026-04-14
- Earliest claimed: 2018-12-28
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Yusaku Matsuo; Taku Matsumura
- Web page: https://patentgrep.com/patent/US12603286B2

## CPC

- C08F 220/1804: {C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate}
- H01M 4/622: {being polymers}
- C08L 33/08: Homopolymers or copolymers of acrylic acid esters
- H01M 4/133: Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
- H01M 4/139: Processes of manufacture
- H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
- H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
- H01M 4/625: {Carbon or graphite}
- H01M 10/0562: Solid materials
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 2004/027: {Negative electrodes}
- H01M 2004/028: {Positive electrodes}
- H01M 2300/0068: inorganic
- H01M 2300/0082: Organic polymers
- Y02E 60/10: Energy storage using batteries
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Provided is a conductive material paste for an all-solid-state secondary battery electrode that can bring about sufficiently reduced internal resistance and excellent high-temperature cycle characteristics in an all-solid-state secondary battery. The conductive material paste for an all-solid-state secondary battery electrode contains a conductive material, a polymer including a (meth)acrylic acid ester monomer unit in a proportion of not less than 25 mass % and not more than 95 mass %, and an organic solvent having a solubility parameter (SP value) of not less than 6.4 (cal/cm3)1/2 and not more than 10.0 (cal/cm3)1/2.

## Claims

### Claim 1

A conductive material paste for an all-solid-state secondary battery electrode comprising: a conductive carbon material; a polymer including a butyl acrylate monomer unit in a proportion of not less than 25 mass % and not more than 85 mass %; and an organic solvent having a solubility parameter (SP value) of not less than 8.0 (cal/cm3)1/2 and not more than 10.0 (cal/cm3)1/2,
wherein an amount of the conductive carbon material among 100 parts by mass of solid content in the conductive material paste is more than 10 parts by mass, and 95 parts by mass or less,
a solid content concentration of the conductive material paste is 5 mass % or more, and 20 mass % or less, and
the polymer further includes an α,β-unsaturated nitrile monomer unit constituting a proportion of not less than 4 mass % and not more than 20 mass % in the polymer.

### Claim 2 (depends on 1)

The conductive material paste for an all-solid-state secondary battery electrode according to claim 1, wherein the polymer further includes a hydrophobic monomer unit.

### Claim 3 (depends on 2)

The conductive material paste for an all-solid-state secondary battery electrode according to claim 2, wherein the hydrophobic monomer unit constitutes a proportion of not less than 3 mass % and not more than 60 mass % in the polymer.

### Claim 4 (depends on 1)

A slurry composition for an all-solid-state secondary battery electrode comprising: the conductive material paste for an all-solid-state secondary battery electrode according to claim 1; a solid electrolyte; and an electrode active material,
wherein the amount of the conductive carbon material is 1.0 parts by mass or more, and 5 parts by mass or less per 100 parts by mass, in total, of the electrode active material and the solid electrolyte.

### Claim 5 (depends on 4)

An electrode for an all-solid-state secondary battery comprising an electrode mixed material layer formed using the slurry composition for an all-solid-state secondary battery electrode according to claim 4.

### Claim 6 (depends on 5)

An all-solid-state secondary battery comprising the electrode for an all-solid-state secondary battery according to claim 5.

### Claim 7 (depends on 1)

The conductive material paste for an all-solid-state secondary battery electrode according to claim 1, wherein the polymer has a gel content of 50 mass % or less.

### Claim 8 (depends on 1)

The conductive material paste for an all-solid-state secondary battery electrode according to claim 1, wherein the organic solvent is butyl butyrate.