ELECTRODE AND SECONDARY BATTERY USING IT

摘要

PROBLEM TO BE SOLVED: To improve the adhesiveness between an electrode active material and a current collector and provide a battery electrode and a secondary battery excellent in cycle characteristic by processing the surface of the current collector of the electrode with an acrylic copolymer having the carboxylic acid group. SOLUTION: The current collector of an electrode is brought into contact with a solution dissolved with an acrylic copolymer in a solvent to stick the acrylic copolymer on the surface of the current collector. The ratio of a monomer having the carboxylic acid group or the carboxylic acid anhydride in the acrylic copolymer is set to 0.5-20wt.% of the copolymer. An electrode constituting material layer constituted of at least an electrode active material and a binder is formed on the processed surface of the current collector. A polyvinylidene fluoride resin is used for the binder. The electrode having strong adhesive strength between the electrode active material and the current collector is obtained. When this electrode is applied to a secondary battery, the secondary battery having an undeteriorating discharge capacity is obtained.