Patent ID: 8277976

Claim:
A binder of polymer particles obtained by polymerizing a composition in the presence of a solvent and optionally a surfactant, the composition consisting of: (a) 1-80 parts by weight of an acrylic or methacrylic acid ester monomer; (b) 1-20 parts by weight of an unsaturated carboxylic acid monomer; (c) 0.001-40 parts by weight of at least one vinyl monomer selected from the group consisting of styrene, α-methylstyrene, β-methylstyrene, and p-t-butylstyrene, (d) 0-70 parts by weight of a conjugated diene monomer as a polymerizable monomer, and (e) at least one additive selected from the group consisting of a molecular weight modifier, a crosslinking agent and a polymerization initiator, based on 100 parts by weight of the binder polymer, and which allows electrode active material particles capable of lithium intercalation/deintercalation to be fixed and linked among themselves, and between the particles and a current collector.