METHOD OF MANUFACTURING SOLID ELECTROLYTIC CAPACITOR AND SOLID ELECTROLYTIC CAPACITOR
A method of manufacturing a solid electrolytic capacitor includes the steps of forming a dielectric film on a surface of an anode element, forming a first conductive polymer layer on the dielectric film, impregnating the anode element having the first conductive polymer layer formed with an ion liquid, and forming a second conductive polymer layer on the first conductive polymer layer after impregnation with the ion liquid.
1 . A method of manufacturing a solid electrolytic capacitor, comprising the steps of:
forming a dielectric film on a surface of an anode element;
forming a first conductive polymer layer on said dielectric film;
impregnating said anode element having said first conductive polymer layer formed with an ion liquid; and
forming a second conductive polymer layer on said first conductive polymer layer after impregnation with said ion liquid.
2 . The method of manufacturing a solid electrolytic capacitor according to claim 1 , wherein
said second conductive polymer layer is formed through electrolytic polymerization.
3 . The method of manufacturing a solid electrolytic capacitor according to claim 1 , wherein
said first conductive polymer layer is formed through chemical polymerization.
4 . The method of manufacturing a solid electrolytic capacitor according to claim 1 , comprising the step of cleaning said anode element having said first conductive polymer layer formed before the step of impregnating said anode element with an ion liquid.
5 . The method of manufacturing a solid electrolytic capacitor according to claim 3 , wherein
said chemical polymerization is vapor phase polymerization.
6 . The method of manufacturing a solid electrolytic capacitor according to claim 1 , wherein
said anode element having said first conductive polymer layer formed is impregnated with said ion liquid by using a solution prepared such that a content of said ion liquid is not lower than 10 weight %.
7 . A solid electrolytic capacitor, comprising a capacitor element which has an anode element having a dielectric film formed on a surface thereof and a conductive polymer layer formed on said anode element,
said conductive polymer layer having a first conductive polymer layer formed on said dielectric film and a second conductive polymer layer formed on said first conductive polymer layer,
an ion liquid being present in said first conductive polymer layer, and
said second conductive polymer layer having a structure denser than said first conductive polymer layer.
8 . The solid electrolytic capacitor according to claim 7 , wherein
said ion liquid is present in said first conductive polymer layer in a larger amount around said second conductive polymer layer, than around said dielectric film.
9 . The solid electrolytic capacitor according to claim 7 , wherein
said first conductive polymer layer is constituted of a plurality of conductive polymer portions present in a distributed manner on said dielectric film.