Solid electrolytic capacitor and method of producing same
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorKazutoyo Horio
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Abstract
To provide a solid electrolytic capacitor capable of high performance, the capacitor including: an anode element made of tantalum or niobium; a dielectric film disposed on the anode element; and a solid electrolytic layer disposed on the dielectric film, the dielectric film including: a first dielectric film made of an oxide of the tantalum or niobium, formed on a surface of the anode element; and a second dielectric film made of a composite metal oxide having a perovskite structure, formed on the first dielectric film.
Claims17
A solid electrolytic capacitor comprising:
- an anode element comprising tantalum or niobium;
- a dielectric film disposed on a surface of the anode element;
- and
- a solid electrolytic layer disposed on the dielectric film,
- the dielectric film comprising:
- a first dielectric film comprising an oxide of the tantalum or niobium formed on the surface of the anode element;
- and
- a second dielectric film comprising a composite metal oxide having a perovskite structure formed on the first dielectric film,
- wherein the second dielectric film is partially formed on the first dielectric film, and
- the solid electrolytic layer is in contact with each of the first dielectric film not covered with the second dielectric film, and the second dielectric film.
A method for producing a solid electrolytic capacitor, the method comprising the steps of:
- making an anode element comprising tantalum or niobium;
- forming, on a surface of the anode element, at least one of a metal film comprising titanium, and a metal oxide film comprising an oxide of titanium;
- subjecting the anode element to chemical conversion treatment, thereby to form a first dielectric film comprising an oxide of the tantalum or niobium on the surface of the anode element;
- subjecting the anode element to hydrothermal reaction so that the metal film or the metal oxide film converts to a composite metal oxide, thereby to form a second dielectric film comprising the composite metal oxide containing the titanium;
- and
- forming a solid electrolytic layer on the dielectric film comprising the first and second dielectric films.
A method for producing a solid electrolytic capacitor, the method comprising the steps of:
- forming, on a surface of particles of a powder of tantalum or niobium, at least one of a metal film comprising titanium, and a metal oxide film comprising an oxide of titanium;
- sintering the powder of the tantalum or niobium having the metal film or the metal oxide film, thereby to make an anode element having thereon the metal film or the metal oxide film;
- subjecting the anode element to chemical conversion treatment, thereby to form a first dielectric film comprising an oxide of the tantalum or niobium on a surface of the anode element;
- subjecting the anode element to hydrothermal reaction so that the metal film or the metal oxide film converts to a composite metal oxide, thereby to form a second dielectric film comprising the composite metal oxide containing the titanium;
- and
- forming a solid electrolytic layer on the dielectric film comprising the first and second dielectric films.
A method for producing a solid electrolytic capacitor, the method comprising the steps of:
- making an anode element comprising a first metal;
- forming, on a surface of the anode element, at least one of a metal film comprising a second metal different from the first metal, and a metal oxide film comprising an oxide of the second metal;
- subjecting the anode element to hydrothermal reaction so that the metal film or the metal oxide film converts to a composite metal oxide, thereby to form a second dielectric film comprising the composite metal oxide containing the second metal;
- after formation of the second dielectric film, subjecting the anode element to chemical conversion treatment so that the first metal of the surface part of the anode element converts to an oxide, thereby to form a first dielectric film comprising the oxide of the first metal;
- and
- forming a solid electrolytic layer on the dielectric film comprising the first and second dielectric films.
Dependencies are inferred from the claim text.