Electrolytic capacitor and manufacturing method therefor
An electrolytic capacitor includes a capacitor element, and an electrolyte solution with which the capacitor element is impregnated. The capacitor element includes an anode foil having a dielectric layer on a surface thereof, and a solid electrolyte layer including a conductive polymer and in contact with the dielectric layer of the anode foil. The electrolyte solution contains at least one of polyalkylene glycol and a derivative of polyalkylene glycol, and at least one of diphenyl amine, naphthol, nitrophenol, catechol, resorcinol, hydroquinone, and pyrogallol.
1. An electrolytic capacitor comprising:
a capacitor element having:
an anode foil having a dielectric layer thereon; and
a solid electrolyte layer including a conductive polymer and in contact with the dielectric layer, and
an electrolyte solution with which the capacitor element is impregnated,
wherein the electrolyte solution contains:
a solvent including at least one of polyalkylene glycol and derivatives thereof, and
a component including at least one of diphenyl amine, naphthol, nitrophenol, catechol, resorcinol, hydroquinone, pyrogallol, trimellitic acid, pyromellitic acid, boric acid, boric-acid compounds, phosphoric acid, phosphoric-acid compounds, and complexes of mannitol and boric acid.
2. The electrolytic capacitor according to claim 1 ,
wherein the component contains at least one of catechol, resorcinol, hydroquinone, pyrogallol, pyromellitic acid, and boric acid.
3. An electrolytic capacitor comprising:
an anode foil having a dielectric layer thereon;
a solid electrolyte layer including a conductive polymer and in contact with the dielectric layer;
a solvent in contact with the dielectric layer and including at least one of polyalkylene glycol and derivatives thereof; and
a component dissolved in the solvent and including at least one of diphenyl amine, naphthol, nitrophenol, catechol, resorcinol, hydroquinone, pyrogallol, trimellitic acid, pyromellitic acid, boric acid, boric-acid compounds, phosphoric acid, phosphoric-acid compounds, and complexes of mannitol and boric acid.
4. The electrolytic capacitor according to claim 3 ,
wherein the component includes at least one of catechol, resorcinol, hydroquinone, pyrogallol, pyromellitic acid, and boric acid.
5. A manufacturing method for an electrolytic capacitor, the method comprising:
forming a capacitor element including an anode foil having a dielectric layer thereon, and a solid electrolyte layer including a conductive polymer and in contact with the dielectric layer; and
impregnating the capacitor element with an electrolyte solution,
wherein the solid electrolyte layer is formed by impregnating the capacitor element with a dispersion solution containing at least one of polythiophene and derivatives thereof dispersed in a dispersion medium, and removing the dispersion medium from the dispersion solution thereafter, and
the electrolyte solution contains:
a solvent including at least one of polyalkylene glycol and derivatives thereof, and
a dissolved component including at least one of diphenyl amine, naphthol, nitrophenol, catechol, resorcinol, hydroquinone, pyrogallol trimellitic acid, pyromellitic acid, boric acid, boric-acid compounds, phosphoric acid, phosphoric-acid compounds, and complexes of mannitol and boric acid.
6. The method according to claim 5 ,
wherein the dissolved component includes at least one of catechol, resorcinol, hydroquinone, pyrogallol, pyromellitic acid, and boric acid.
7. The electrolytic capacitor according to claim 1 ,
wherein a total weight content of polyalkylene glycol and derivatives thereof in the solvent is 15 wt % or greater with respect to a weight of the electrolyte solution.
8. The electrolytic capacitor according to claim 3 ,
wherein a total weight content of polyalkylene glycol and derivatives thereof in the solvent is 15 wt % or greater with respect to a total weight of the solvent and the component.
9. The method according to claim 5 ,
wherein a total weight content of polyalkylene glycol and derivatives thereof in the solvent is 15 wt % or greater with respect to a weight of the electrolyte solution.