Patent ID: 11870077
Assignee: LG CHEM, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C  Y | IPC C  H

Claim 7:
8. A method of preparing a binder composition for a secondary battery electrode, comprising:
1) A first step of adding a conjugated diene-based monomer, one or more monomers selected from the group consisting of b1) an aromatic vinyl-based monomer and an unsaturated carboxylic acid-based monomer, and diacetone acrylamide to a solution including an aqueous solvent, an emulsifier, and a polymerization initiator to allow polymerization to form a polymerization resultant; and
2) A second step of adjusting a pH of the polymerization resultant at pH of 7 to 8, and then adding adipic acid dihydrazide thereto, followed by mixing,
wherein the second step includes performing secondary crosslinking by mixing and drying at a temperature of 0° C. to 50° C. for 10 min to 3 hr, and
wherein the binder composition comprises a copolymer including:
a) a first repeating unit derived from the conjugated diene-based monomer;
b) second repeating units derived from one or more monomers selected from the group consisting of b1) the aromatic vinyl-based monomer and b2) the unsaturated carboxylic acid-based monomer;
c) a third repeating unit including a crosslinked structure of the diacetone acrylamide and the adipic acid dihydrazide;
wherein the diacetone acrylamide is included in an amount of 0.1 part by weight to 3 parts by weight with respect to total 100 parts by weight of the conjugated diene-based monomer, and one or more monomers selected from the group consisting of the aromatic vinyl-based monomer and the unsaturated carboxylic acid-based monomer, and
wherein the adipic acid dihydrazide is included in an amount of 0.02 parts by weight to 3 parts by weight with respect to total 100 parts by weight of the conjugated diene-based monomer, and one or more monomers selected from the group consisting of the aromatic vinyl-based monomer and the unsaturated carboxylic acid-based monomer.