Carbon nanotube dispersion and method for producing same
The present disclosure relates to a carbon nanotube dispersion liquid comprising bundle-type carbon nanotubes; a dispersion medium; and a polyvinyl butyral resin having a weight average molecular weight of greater than 50,000, a method for preparing the same, methods for preparing electrode slurry and an electrode using the same, and an electrode and a secondary battery prepared using the carbon nanotube dispersion liquid.
1. A carbon nanotube dispersion liquid comprising:
bundle-type carbon nanotubes;
a dispersion medium; and
a polyvinyl butyral resin having a weight average molecular weight of greater than 50,000,
wherein dispersed particle diameters of the bundle-type carbon nanotubes have particle size distributions D 50 of 3 μm to 10 μm, D 10 is 1 μm or greater, and D 90 is 30 μm or less.
2. The carbon nanotube dispersion liquid of claim 1 , wherein the polyvinyl butyral resin has a weight average molecular weight of 150,000 or greater.
3. The carbon nanotube dispersion liquid of claim 1 , wherein the polyvinyl butyral resin has a weight average molecular weight of 200,000 or greater.
4. The carbon nanotube dispersion liquid of claim 1 , wherein a content of a hydroxyl group-containing repeating unit of the polyvinyl butyral resin is 15% by weight or greater.
5. The carbon nanotube dispersion liquid of claim 1 , wherein a content of a hydroxyl group-containing repeating unit of the polyvinyl butyral resin is 20% by weight or greater.
6. The carbon nanotube dispersion liquid of claim 1 , wherein the polyvinyl butyral resin comprises a first polyvinyl butyral resin having a weight average molecular weight of greater than 50,000; and a second polyvinyl butyral resin having a lower weight average molecular weight than the first polyvinyl butyral resin.
7. A method for preparing the carbon nanotube dispersion liquid of claim 1 comprising mixing bundle-type carbon nanotubes, and a polyvinyl butyral resin having a weight average molecular weight of greater than 50,000.
8. A method for preparing electrode slurry comprising mixing the carbon nanotube dispersion liquid of claim 1 , an electrode active material and a binder resin.
9. A method for preparing an electrode comprising:
preparing 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.
10. Electrode slurry comprising:
the carbon nanotube dispersion liquid of claim 1 ;
an electrode active material; and
a binder resin.
11. An electrode prepared using electrode slurry comprising the carbon nanotube dispersion liquid of claim 1 , an electrode active material and a binder resin.
12. A secondary battery comprising the electrode of claim 11 .