Carbon nanotube dispersion liquid and manufacturing method thereof
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.
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.