SOLID ELECTROLYTIC CAPACITOR

摘要

PROBLEM TO BE SOLVED: To improve the adhesion property of a conductive polymer layer to the side of cathode coil and to suppress the reduction in capacitance after aging treatment by forming a coating that is thinner than a formation coating on the side of anode foil at the cathode foil of an individual electrolytic capacitor for forming a conductive polymer layer in an element. SOLUTION: A capacitor element 7 is constituted by taking up anode formation foil 1 and counter cathode foil 2 via a separator 3. Anode and cathode lead terminals 51 and 52 are extracted from the anode foil formation 1 and the counter cathode foil 2 via anode and cathode lead bosses 61 and 62. In the anode formation foil 1, foil made of a valve operation metal such as aluminum is subjected to etching treatment for roughening and then a dielectric formation coating is formed. Aluminum is used also as the material of the cathode foil 2, and a formation coating that is thinner than that of the anode foil is formed on the surface. The thickness of the formation coating is nearly proportional to a formation voltage. The formation voltage of the anode foil is set to several to a several voltage to several tens of voltages according to a desired rated voltage or a rated capacitance.