High-specific volume cathode foil solid electrolytic capacitor and preparing method thereof

Abstract

This invention relates to high specific volume cathode foil solid electrolytic capacitor and its preparation method. This invention provides rolling type solid electrolytic capacitor that dielectric medium is high conductivity polymer, purpose made high specific volume cathode foil is used in the capacitor, so the electric capacity is large, resistor is low. This invention includes aluminum shell, two outgoing line that welded on aluminum peduncle, the peduncle is connected to the cathode and anode foils, the foils wind into capacitor core after isolated by membrane. The core is set in the shell, a layer alumina is brought to the aluminum foil of the cathode foil, and a layer of titanium, titanium nitride or titanium carbonitride membrane is formed on the alumina surface. Solid conductingmaterial is set on the membrane between the two poles. The content of the capacitor in this invention is large, ESR is low, life is long, capability is reliable, it can be widely applied to modern communication, computer, and high performance civil and military digital product.

Description

technical field [0001] The invention relates to a coiled solid electrolytic capacitor, in particular to a coiled solid electrolytic capacitor using carbon plating on the surface of aluminum or titanium as cathode foil and a manufacturing method thereof. Background technique [0002] Capacitor is a basic electronic component, which is widely used in various electronic products. In recent years, with the rapid development of the electronic industry, electronic products have shown a trend of miniaturization and light weight, especially the emergence of digital products and personal computers. In order to meet the high-speed requirements, the capacitors used in it are required to be miniaturized, large-capacity, and low-impedance in the high-frequency region. [0003] For conductive polymer solid electrolytic capacitors, its capacity and impedance are closely related to the closeness and contact area between the solid electrolyte and the aluminum foil. The tighter the solid elec...

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Problems solved by technology

However, after being carbonized at high temperature in the air for a period of time, you will find that its capacity is greatly attenuated, and its impedance and ESR value have also increased a lot, which has caused great difficulties for using it as a cathode foil for solid capacitors.

[0011] Through the analysis of the surface of this kind of high specific volume cathode foil, it is found that at high temperature, the oxygen in the air mainly oxidizes the bonding part of aluminum and titanium, oxidizes the surface of aluminum, and forms an oxide layer, which causes the original tightly adhered The degree of bonding between the metal titanium on the aluminum surface and the substrate decreases, resulting in a sharp drop in capacity, and a sharp increase in impedance and ESR

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