Carbon nanotube dispersion liquid and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-10141574-B2
Application number	US-201615577099-A
Country	US
Kind code	B2
Filing date	Sep 5, 2016
Priority date	Sep 9, 2015
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

The present disclosure relates to a carbon nanotube dispersion including carbon nanotubes, a dispersion medium, and partially hydrogenated nitrile rubber having a residual double bond (RDB) value of 0.5% by weight to 40% by weight calculated according to Mathematical Formula 1, a method for preparing the same, and methods for preparing electrode slurry and an electrode using the same.

First claim

The invention claimed is:

1. A carbon nanotube dispersion comprising:
bundle-type carbon nanotubes;
a dispersion medium; and
partially hydrogenated nitrile rubber having a residual double bond (RDB) value of 0.5% by weight to 40% by weight calculated according to the following Mathematical Formula 1,
wherein dispersed particle diameters of the carbon nanotubes have a particle size distribution D 50 of 3 μm to 10 μm:
RDB (% by weight)=BD weight/(BD weight+HBD weight)×100  [Mathematical Formula 1]

in Mathematical Formula 1, BD is a conjugated diene-derived structure unit and HBD is a hydrogenated conjugated diene-derived structure unit.

2. The carbon nanotube dispersion of claim 1 , wherein the partially hydrogenated nitrile rubber comprises an α,β-unsaturated nitrile-derived structure unit, a conjugated diene-derived structure unit and a hydrogenated conjugated diene-derived structure unit.

3. The carbon nanotube dispersion of claim 2 , comprising the α,β-unsaturated nitrile-derived structure unit in 20% by weight to 50% by weight with respect to a total weight of the rubber.

4. The carbon nanotube dispersion of claim 1 , comprising a carbon nanotube complex in which the partially hydrogenated nitrile rubber is introduced to surfaces of the carbon nanotubes.

5. The carbon nanotube dispersion of claim 4 , wherein the carbon nanotube complex has particle size distribution such that D 50 is from 3 μm to 10 μm, D 10 is 1 μm or greater, and D 90 is 20 μm or less.

6. The carbon nanotube dispersion of claim 1 , wherein the partially hydrogenated nitrile rubber comprises a unit of the following Chemical Formula 1, a unit of the following Chemical Formula 2, and a unit of the following Chemical Formula 3:

7. The carbon nanotube dispersion of claim 1 , wherein the partially hydrogenated nitrile rubber has a weight average molecular weight of 10,000 g/mol to 700,000 g/mol.

8. The carbon nanotube dispersion of claim 1 , wherein the partially hydrogenated nitrile rubber has a polydispersity index PDI (Mw/Mn) ratio of 2 to 6.

9. A method for preparing the carbon nanotube dispersion of claim 1 comprising mixing the bundle-type carbon nanotubes, the dispersion medium and the partially hydrogenated nitrile rubber described above.

10. A method for preparing electrode slurry comprising mixing the carbon nanotube dispersion of claim 1 , an electrode active material and a binder resin.

11. A method for preparing an electrode comprising:
preparing an electrode slurry by mixing the carbon nanotube dispersion of claim 1 , an electrode active material and a binder resin; and
forming an electrode using the electrode slurry.

Assignees

• Lg Chemical Ltd

Inventors

• Yoo Houngsik
• Kang Kyungyeon
• Seol Jongheon
• Lee Jong Won
• Kim Dong Hyun
• Kwon Gyemin
• Woo Jihee
• Kim Yelin
• Cho Dong Hyun
• Choy Sang Hoon
• Choi Hyeon

Classifications

• B82Y40/00

  Manufacture or treatment of nanostructures · CPC title

• H01M4/623

  fluorinated polymers · CPC title

• Y10S977/746

  Modified with biological, organic, or hydrocarbon material · CPC title

• H01M4/0404

  by coating on electrode collectors · CPC title

• C09D109/02

  Copolymers with acrylonitrile · CPC title