Patent ID: 8663845
Filing Date: 2014-03-04
Classification: H01M,Y02E

Abstract:
1. A secondary-battery cathode comprising: a current collector comprising a foil and a conductive film adhered on a surface of the foil; and a cathodic electroactive film adhered on a surface of the conductive film of the current collector and comprising a binder, carbon fine particles and a cathodic electroactive material, wherein the foil comprises one of aluminum and copper and has a thickness which is in a range of more than 5 μm and 100 μm or less, the conductive film has a thickness which is in a range of 0.1 μm or more and 10 μm or less, the conductive film comprises an ion-permeable compound and carbon fine articles, the ion-permeable compound comprises a cross-linked polysaccharide which is a polysaccharide polymer cross-linked with a cross-linking agent, the conductive film is formed to electrically connect the foil and a cathodic electroactive film in a secondary battery and has the carbon fine particles in an amount sufficient to provide conduction of electrons in the conductive film positioned between the foil and the cathodic electroactive film in the secondary battery, and the carbon fine particles have particle sizes in a range of 10 nm to 100 nm, wherein the cross-linking agent comprises at least one selected from the group consisting of acrylamide, acrylonitrile, chitosan pyrrolidone carboxylate salt, hydroxypropylchitosan, phthalic anhydride, maleic anhydride, trimellitic anhydride, and pyromellitic anhydride.