Carbon black dispersion solution and manufacturing method therefor
The present disclosure relates to a carbon black dispersion solution comprising carbon black, 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 black have particle size distribution D 50 of 0.1 μm to 2 μm, a method for preparing the same, and methods for preparing electrode slurry and an electrode using the same.
1. A carbon black dispersion solution comprising:
carbon black;
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 black have particle size distribution D 50 of 0.1 μm to 2 μm:
RDB (% by weight)= BD weight/( BD weight+ HBD weight)×100 [Mathematical Formula 1]
in Mathematical Formula 1, BD means a conjugated diene-derived structure unit and HBD means a hydrogenated conjugated diene-derived structure unit,
wherein the carbon black is included in 10% by weight to 30% by weight based on a total weight of the dispersion solution, and
wherein the partially hydrogenated nitrile rubber is included in 5 parts by weight to 50 parts by weight with respect to 100 parts by weight of the carbon black.
2. The carbon black dispersion solution 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 black dispersion solution 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 black dispersion solution of claim 1 , comprising a carbon black complex in which the partially hydrogenated nitrile rubber is introduced to a surface of the carbon black.
5. The carbon black dispersion solution of claim 1 , wherein the dispersed particle diameters of the carbon black have particle size distribution such that D 90 is 10 μM or less, and D 10 is from 0.1 μm to 0.4 μm.
6. The carbon black dispersion solution 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 black dispersion solution 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 black dispersion solution 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 black dispersion solution of claim 1 comprising mixing carbon black, 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.
10. A method for preparing electrode slurry comprising mixing the carbon black dispersion solution of claim 1 , an electrode active material and a binder resin.
11. A method for preparing an electrode comprising:
preparing electrode slurry by mixing the carbon black dispersion solution of claim 1 , an electrode active material and a binder resin; and
forming an electrode using the electrode slurry.