Patent ID: 7935442

Claim:
An electrochemical device, which comprises: (A) a binder of polymer particles obtained by polymerizing a composition consisting of: (a) 20˜79 parts by weight of a (meth)acrylic acid ester monomer; (b) 20˜60 parts by weight of at least one vinyl monomer selected from the group consisting of styrene, α-methylstyrene, β-methylstyrene and p-t-butystyrene; (c) 0.01˜30 parts by weight of an unsaturated carboxylic acid monomer; and (d) 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 a binder polymer; and (B) electrochemical cells stacked multiply by using the binder, wherein the binder allows electrode active materiel particles in an electrode to be fixed and interconnected among themselves and between the electrode active material and a collector, and the electrode and a separator that is in contact with the electrode are bonded to each other by way of hot fusion.