Patent ID: 9627145
Date: 2017-04-18
CPC Classifications: H01G

Claim:
1. An electrolytic capacitor provided with a capacitor element in which an anode foil having an anode internal terminal and a cathode foil having a cathode internal terminal with its purity greater or equal to 99.9% are wound or laminated through a separator, the capacitor element being impregnated with an electrolyte, wherein at the beginning of the winding only the cathode foil firstly starts being wound and then the anode foil is wound together so that the winding start edge of the cathode foil exists beyond the winding start edge of the anode foil along the winding direction, and at the end of the winding the cathode foil is wound beyond the winding end of the anode foil so that only the cathode foil comes at the winding end portion along the winding direction, said cathode foil is performed with an etching treatment and said cathode internal terminal is comprised of a lysis-treated aluminum performed with an etching magnification greater or equal to 5% of said etching treatment performed for said cathode foil, the iron concentration in the lysis-treated layer formed through said lysis treatment is less than 40 ppm and the alkalization of a driving electrolysis when it is being charged or discharged is prevented, and the capacitor element is impregnated with the electrolyte, and wherein the electrolyte contains an amine salt.