Carbon nanotube dispersion and method for preparing the same

Patent metadata

Field	Value
Publication number	US-11542164-B2
Application number	US-201917049477-A
Country	US
Kind code	B2
Filing date	Jun 7, 2019
Priority date	Jun 11, 2018
Publication date	Jan 3, 2023
Grant date	Jan 3, 2023

Abstract

The present invention relates to a carbon nanotube dispersion including carbon nanotubes, a polymer dispersant containing an amine, a phenolic compound including two or more aromatic rings, and an aqueous solvent, wherein the polymer dispersant and the phenolic compound including two or more aromatic rings are included in a weight ratio of 100:1 to 100:90, and having low viscosity and a small change of viscosity over time.

First claim

The invention claimed is:

1. A carbon nanotube dispersion, comprising:
carbon nanotubes, a polymer dispersant containing an amine, a phenolic compound comprising two or more aromatic rings, and an aqueous solvent,
wherein the polymer dispersant containing an amine and the phenolic compound comprising two or more aromatic rings are present in a weight ratio of 100:10 to 100:80.

2. The carbon nanotube dispersion according to claim 1 , wherein the carbon nanotube has a specific surface area (BET) of 210 m 2 /g or less.

3. The carbon nanotube dispersion according to claim 1 , wherein the carbon nanotube is present in 2 parts by weight to 10 parts by weight, based on 100 parts by weight of the dispersion.

4. The carbon nanotube dispersion according to claim 1 , wherein the polymer dispersant containing an amine is one or more selected from the group consisting of polyvinylpyrrolidone, polyacrylic acid hydrazide, poly-N-vinyl-5-methoxazolidon, N-alkyl polyimine, N-acetyl polyimine, polyacrylamide, poly-L-lysine hydrobromide, benzyl-dodecyl-dimethylammonium chloride, and polyethylenimine.

5. The carbon nanotube dispersion according to claim 1 , wherein the two or more aromatic rings are selected from the group consisting of a phenol structure, a catechol structure, a gallol structure and a naphthol structure.

6. The carbon nanotube dispersion according to claim 1 , wherein the phenolic compound comprising two or more aromatic rings does not comprise a fused structure of three or more aromatic rings in a molecular structure.

7. The carbon nanotube dispersion according to claim 1 , wherein the phenolic compound comprising two or more aromatic rings is one or more selected from the group consisting of baicalin, luteolin, taxifolin, myricetin, quercetin, rutin, catechin, epigallocatechin, gallate, butein, piceatannol and tannic acid.

8. The carbon nanotube dispersion according to claim 1 , wherein the carbon nanotube dispersion comprises the polymer dispersant and the phenolic compound comprising two or more aromatic rings in an amount of 11 parts by weight to 100 parts by weight, in total amount based on 100 parts by weight of the carbon nanotube.

9. An electrode slurry composition for a lithium secondary battery, comprising the carbon nanotube dispersion according to claim 1 and an electrode active material.

10. A method for preparing the carbon nanotube dispersion of claim 1 , the method comprising:
(1) preparing a mixture by mixing the carbon nanotubes, the polymer dispersant containing an amine, the phenolic compound comprising two or more aromatic rings, and the aqueous solvent; and
(2) milling the mixture.

Assignees

• Lg Chemical Ltd

Inventors

• Kim Dong Hyun
• Yoo Houng Sik
• Cha Jin Myung
• Kwon Gye Min
• Chae Hyun Sik
• Cho Dong Hyun
• Choy Sang Hoon
• Choi Hyeon
• Cho Hyung Suk

Classifications

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• C09C1/56 Primary

  Treatment of carbon black {; Purification} · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• C01B2202/32

  Specific surface area · CPC title

• C01B2202/28

  Solid content in solvents · CPC title