Abstract: An electrochemical element electrode for obtaining electrochemical elements having both low internal resistance and high capacitance, and a secondary battery and an electric double layer capacitor using the electrode are provided. An electrochemical element electrode which is made by forming an active material layer on a collector, and the active material layer is formed by press-molding composite particles with high strength at moderate pressure not to crush the composite particles under pressure, while the structures of the composite particles being maintained, to bond the composite particles together, wherein the composite particles comprise an electrode active material, an electric conductive material, a dispersible binder and a soluble resin, in which the electrode active material and the electric conductive material are bonded by the dispersible binder. By use of this electrode, an electric double layer capacitor or a secondary battery is obtained.

Abstract: An electrode material for an electric double layer capacitor, where a moldability is good, a flexion resistance and a cohesiveness to a current collector after molding into an active material layer are high and an internal resistance can be reduced, an electrode for an electric double layer capacitor obtained using the electrode material, and a capacitor are provided. The electrode material for the electric double layer capacitor is composed of a mixture particle containing a binder and an electrode active material, and in said mixture particle, 50 area % or more of a surface of said mixture particle has been coated with the binder.

Abstract: The present invention relates to a technique for producing a cathode film having a thin and even thickness and having stable electrical characteristics at a high productivity by an extrusion molding method. That is, the present invention provides an active material for a cathode film comprising a lithium compound having a void fraction of 0.36 or less and a polyether polymer composition for a cathode film comprising a polyether polymer, an electrolytic salt compound which is soluble in the above polymer and the active material for a cathode film described above. The object described above can be achieved by extrusion-molding them.

Abstract: There are provided a cathode film for batteries which is easy to handle in the form of a film and has excellent mechanical strength and an excellent ion conductivity; a solid electrolyte composition suitable for producing such a cathode film; and a process for efficiently producing such a cathode film. The solid electrolyte composition for cathode which is composed of a polyether polymer, an active material of positive electrode, conductive particles, an electrolyte salt compound and a photopolymerization initiator wherein the photopolymerization initiator is present in an amount of 2 to 30 parts by weight per 100 parts by weight of the polyether polymer, is molded and then crosslinked by irradiation of an ultraviolet light, whereby a cathode film for batteries is obtained. By using this cathode film, a battery with excellent cycle performance can be obtained.