Composite binder composition for all-solid-state battery, electrode slurry comprising same, and method of manufacturing electrode for all-solid-state battery using electrode slurry

Patent metadata

Field	Value
Publication number	US-11777094-B2
Application number	US-202117332413-A
Country	US
Kind code	B2
Filing date	May 27, 2021
Priority date	Jul 28, 2020
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A composite binder composition for an all-solid-state battery includes: a first polymer comprising a repeating structure represented by Chemical Formula 1a or Chemical Formula 1b below, and a second polymer comprising at least one selected from a group consisting of diene-based rubber, polysiloxane, and combinations thereof:

First claim

What is claimed is:

1. A binder composition for an all-solid-state battery, the binder composition comprising:
a first polymer comprising a repeating structure represented by Chemical Formula 1a below:

and
a second polymer comprising diene-based rubber,
wherein in Chemical Formula 1a, R 1 comprises hydrogen, a halogen element or a C1-4 alkyl group, R 2 comprises an unsubstituted C1-4 alkyl group or an ether group in which a portion of carbon atoms of the alkyl group is substituted with oxygen, and m is an integer of 40 to 2,000,
wherein the diene-based rubber comprises at least one selected from a group consisting of 1,4-polybutadiene, 1,2-polybutadiene, and combinations thereof,
wherein the first polymer and the second polymer are copolymerized,
wherein the binder composition is represented by Chemical Formula 3 below:

and
wherein in Chemical Formula 3, m is an integer of 40 to 2,000, and n is an integer of 1,500 to 15,000.

2. The binder composition of claim 1 , comprising:
50 wt % or less but exceeding 0 wt % of the first polymer; and
50 wt % to less than 100 wt % of the second polymer.

3. The binder composition of claim 1 , wherein 50 mol % or less but exceeding 0 mol % of the first polymer and 50 mol % to less than 100 mol % of the second polymer are copolymerized.

4. The binder composition of claim 1 , wherein the first polymer and the second polymer are block copolymerized.

5. An electrode slurry for an all-solid-state battery, the electrode slurry comprising:
a binder solution comprising a binder composition and a solvent;
an electrode active material;
a conductive material; and
a solid electrolyte,
wherein the binder composition comprises:
a first polymer comprising a repeating structure represented by Chemical Formula 1a below:

and
a second polymer comprising diene-based rubber,

wherein in Chemical Formula 1a, R 1 comprises hydrogen, a halogen element or a C1-4 alkyl group, R 2 comprises an unsubstituted C1-4 alkyl group or an ether group in which a portion of carbon atoms of the alkyl group is substituted with oxygen, and m is an integer of 40 to 2,000,
wherein the diene-based rubber comprises at least one selected from a group consisting of 1,4-polybutadiene, 1,2-polybutadiene, and combinations thereof, and
wherein the first polymer and the second polymer are copolymerized.

6. The electrode slurry of claim 5 , wherein the solvent comprises at least one selected from a group consisting of butylate, toluene, xylene, anisole, hexane, heptane, dibromomethane, dichloroethane, dichlorohexane, ethanol, glycol ether, and combinations thereof.

7. The electrode slurry of claim 5 , wherein the binder solution comprises:
2.5 wt % to 45 wt % of the binder composition; and
97.5 wt % to 55 wt % of the solvent.

8. The electrode slurry of claim 5 , comprising 0.1 wt % to 10 wt % of the binder solution, 75 wt % to 95 wt % of the electrode active material, 1 wt % to 10 wt % of the conductive material, and 5 wt % to 25 wt % of the solid electrolyte.

9. A method of manufacturing an electrode for an all-solid-state battery, the method comprising:
preparing a binder solution comprising a binder composition and a solvent;
manufacturing an electrode slurry by mixing the binder solution, an electrode active material, a conductive material and a solid electrolyte; and
forming an electrode by applying the electrode slurry on a substrate and performing heat treatment,
wherein the binder composition comprises:
a first polymer comprising a repeating structure represented by Chemical Formula 1a below:

and
a second polymer comprising diene-based rubber,

wherein in Chemical Formula 1a, R 1 comprises hydrogen, a halogen element or a C1-4 alkyl group, R 2 comprises an unsubstituted C1-4 alkyl group or an ether group in which a portion of carbon atoms of the alkyl group is substituted with oxygen, and m is an integer of 40 to 2,000,
wherein the diene-based rubber comprises at least one selected from a group consisting of 1,4-polybutadiene, 1,2-polybutadiene, and combinations thereof, and
wherein the first polymer and the second polymer are copolymerized.

10. The method of claim 9 , wherein the applied electrode slurry is heat-treated at a temperature of 100° C. to 250° C. for 1 min to 15 hr.

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Seoul Nat Univ R&Db Foundation

Inventors

• Kim Sang Mo
• Kwon Tae Young
• Lee Ju Yeon
• Jung Sung Hoo
• Choi Jang Wook
• Lee Ji Eun

Classifications

• H01M4/622 Primary

  being polymers · CPC title

• C08L33/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08L33/12

  Homopolymers or copolymers of methyl methacrylate · CPC title

• C08L47/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00) · CPC title

• H01B1/24

  the conductive material comprising carbon-silicon compounds, carbon or silicon · CPC title