Carbon nanotube dispersion liquid and manufacturing method thereof
The present disclosure relates to a carbon nanotube dispersion including entangled-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 particle size distribution D 50 of 2 μm to 5 μm, a method for preparing the same, and methods for preparing electrode slurry and an electrode using the same.
1. A carbon nanotube dispersion liquid comprising:
entangled-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 particle size distribution D 50 of 2 μm to 5 μm:
RDB (% by weight)=BD weight/(BD weight+HBD weight)×100 [Mathematical Formula 1]
in Mathematical Formula 1, BD is defined as a conjugated diene-derived structure unit and HBD is defined as a hydrogenated conjugated diene-derived structure unit.
2. The carbon nanotube dispersion liquid 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 liquid 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 liquid 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 liquid of claim 1 , wherein the dispersed particle diameters of the entangled-type carbon nanotubes have a particle size distribution such that D 50 is from 2 μm to 5 μm, D 10 is from 0.5 μm to 1.5 μm and D 90 is from 6 μm to 10 μm.
6. The carbon nanotube dispersion liquid 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 liquid 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 liquid 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 liquid of claim 1 , comprising mixing the entangled-type carbon nanotubes, the dispersion medium and the partially hydrogenated nitrile rubber.
10. A method for preparing an electrode slurry comprising mixing the carbon nanotube dispersion liquid 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 liquid of claim 1 , an electrode active material and a binder resin; and
forming an electrode using the electrode slurry.