Patent ID: 8124474

Claim:
A method for producing an electrode for an electric double layer capacitor, comprising: a step of mixing a particulate elastomer with a carbonaceous material to obtain a powdery mixture, the powdery mixture comprising at least the particulate elastomer and the carbonaceous material as solids; wherein the particulate elastomer is selected from the group consisting of polybutadiene modified with a carboxyl group, polyisoprene modified with the carboxyl group and styrene/butadiene copolymer modified with the carboxyl group, the carbonaceous material comprises activated carbon as an active material, and at the time of mixing the particulate elastomer and the carbonaceous material, there is a concentration of solid content of the powdery mixture of 50% or more by weight, based on a total weight of the powdery mixture, the particulate elastomer is evenly absorbed on the carbonaceous material thereby the carbonaceous material and the particulate elastomer are kept in a powder form and a particle diameter of the resultant powdery mixture is from 0.1 to 1000 μm, and a step of dry-forming said powdery mixture to form an electrode layer, wherein the powdery mixture comprises 2 to 10 parts by weight of the particulate elastomer per 100 parts by weight of a combination of the particulate elastomer and the carbonaceous material, and at the time of dry-forming the powdery mixture, the concentration of the solids content of the powdery mixture is 50% or more by weight, based on the total weight of the powdery mixture.