Conductor pre-dispersion slurry for secondary battery electrode, preparation method therefor, electrode manufactured by applying conductor pre-dispersion slurry, and secondary battery comprising same electrode
A conductive material pre-dispersed slurry for a secondary battery electrode includes: a conductive material; a dispersant for dispersing the conductive material; and a solvent mixed with the conductive material and the dispersant. The dispersant includes a cellulose-based compound and a vinyl-based or acrylic compound, and the cellulose-based compound and the vinyl-based or acrylic compound in the dispersant have a weight ratio of about 25:1 to 1:25.
1. A conductive material pre-dispersed slurry for a secondary battery electrode, comprising:
a conductive material;
a dispersant for dispersing the conductive material; and
a solvent mixed with the conductive material and the dispersant,
wherein the dispersant includes a cellulose-based compound and a vinyl-based or acrylic compound,
wherein the cellulose-based compound and the vinyl-based or acrylic compound in the dispersant have a weight ratio of 25:1 to 1:25, and
wherein the conductive material and the dispersant have a weight ratio of 1:0.5 to 1:1.
2. The conductive material pre-dispersed slurry of claim 1 , wherein the cellulose-based compound has a weight-average molecular weight (MW) of 450,000 g/mol or less.
3. The conductive material pre-dispersed slurry of claim 1 , wherein the cellulose-based compound has a degree of esterification (DE) of 0.6 to 1.0.
4. The conductive material pre-dispersed slurry of claim 1 , wherein the cellulose-based compound is one or more selected from the group consisting of methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, benzyl cellulose, trityl cellulose, cyanoethyl cellulose, carboxymethyl cellulose, carboxyethyl cellulose, aminoethyl cellulose, nitrocellulose, cellulose ether, and carboxymethylcellulose sodium salt.
5. The conductive material pre-dispersed slurry of claim 1 , wherein the vinyl-based compound has a weight-average molecular weight (MW) of 6,000 to 80,000 g/mol, and
wherein the acrylic compound has a weight-average molecular weight (MW) of 8,000 to 150,000 g/mol.
6. The conductive material pre-dispersed slurry of claim 1 , wherein the vinyl-based or acrylic compound surrounds a periphery of the conductive material.
7. The conductive material pre-dispersed slurry of claim 1 , wherein the vinyl-based compound is one or more selected from the group consisting of polyvinylpyrrolidone, polyvinyl alcohol, polyvinyl chloride, polyvinyl fluoride, and polyvinyl acetate, and
wherein the acrylic compound is one or more selected from the group consisting of polyacrylic acid, polyacrylamide, and polyacrylonitrile.
8. The conductive material pre-dispersed slurry of claim 1 , wherein the conductive material is one or more selected from the group consisting of graphite, carbon black, graphene, and carbon nanotubes (CNTs).
9. The conductive material pre-dispersed slurry of claim 8 , wherein the carbon nanotubes (CNTs) are multi-walled carbon nanotubes (MWCNTs).
10. The conductive material pre-dispersed slurry of claim 9 , wherein the multi-walled carbon nanotubes (MWCNTs) have a diameter of 4 to 12 nm.
11. The conductive material pre-dispersed slurry of claim 8 , wherein the carbon nanotubes (CNTs) are contained in an amount of more than 0 wt % and not more than 6 wt %.
12. The conductive material pre-dispersed slurry of claim 1 , wherein the conductive material pre-dispersed slurry has a viscosity of 3,000 cPs or less under conditions of a temperature of 25° C. and a shear rate of 50 s −1 .
13. The conductive material pre-dispersed slurry of claim 1 , wherein the conductive material pre-dispersed slurry has a D50 particle size smaller than 0.1 μm.
14. The conductive material pre-dispersed slurry of claim 1 , wherein the solvent includes water.
15. An electrode for a secondary battery, which is manufactured by applying the conductive material pre-dispersed slurry of claim 1 .
16. A secondary battery comprising the electrode of claim 15 .