| 摘要 |
PURPOSE:To suppress deterioration of a charge/discharge capacity and a load characteristic by performing corona discharge treatment in a collector surface prior to applying electrode compound slurry. CONSTITUTION:Metal foil 1 for positive or negative electrode collectors is supplied from a reel 6a. In a corona discharge electrode 2, a surface of the metal foil 1 supplied from the reel 6a is corona discharge treated. A corona discharge is performed in orinary moisture at an ordinary temperature. In a coater 3, electrode compound slurry 4 is applied by a fixed thickness to the corona processed surface of the metal foil 1, to make the foil pass through a drying furnace 5. A solvent in the slurry 4 is removed to dry the slurry. Thereafter, the foil 1 is wound to a reel 6b. The electrode compound slurry is concretely a mixture of carbon, poly fluoride vinylidene and N-methyl pyrolidone. By an active ion kind generated by a discharge, a contamination layer left on a surface layer is removed, and a polarity group of -COOH, >C=0, -OH, etc., is created in the surface. A binder is nitrile butadiene rubber and the like. |
