High specific capacitance capacitor cathode foil and film coating apparatus manufacturing the same

Abstract

The invention discloses a high specific capacitance capacitor cathode foil. The foil possesses an aluminum foil. A surface of the aluminum foil is sputtered with a titanium nitride layer. A surface of the titanium nitride layer is sputtered with a mixing layer of titanium nitride and graphite. By using the high specific capacitance capacitor cathode foil, an experiment shows that the titanium nitride layer and the aluminum foil surface are combined firmly; the mixing layer of the titanium nitride and the graphite and the titanium nitride layer are combined firmly; as the cathode foil, an electric capacity reaches several times of the electric capacity of the aluminum foil and is higher than a carbon foil; the cathode foil possesses lower impedance and losses than the aluminum foil and is especially suitable for making a solid state capacitor and a large capacity electrolytic capacitor. The cathode foil possesses characteristics of a small size, a long service life and good heat stability. The invention simultaneously discloses a film coating apparatus manufacturing the high specific capacitance capacitor cathode foil. The apparatus mainly comprises a vacuum unreeling chamber, a first vacuum film coating chamber, a second vacuum film coating chamber and a vacuum rolling chamber. By using the film coating apparatus, from an unreeling process to a rolling process, continuous film coating can be realized, a film coating speed is fast and production efficiency is high.

Description

technical field [0001] The invention relates to a high specific capacitance negative electrode foil, and also relates to a coating device for preparing the high specific capacitance negative electrode foil. Background technique [0002] In the past, there were mainly two types of negative electrode foils for capacitors. One was pure aluminum foil that was electrochemically corroded on the surface and used directly as negative electrode foil; . [0003] In terms of performance, the corroded aluminum foil is used as the negative electrode foil, which has small capacitance, high impedance and large loss value. Stablize. Compared with the negative electrode foil that corrodes aluminum foil, the performance of carbon foil is greatly improved. The capacitance is several times higher than that of aluminum foil, and the impedance and loss value are small, but the manufacturing cost is high and the production efficiency is low. Solid capacitors have the characteristics of small si...

AI Technical Summary

Problems solved by technology

[0003] In terms of performance, the corroded aluminum foil is used as the negative electrode foil, which has small capacitance, high impedance and large loss value. Stablize

Compared with the negative electrode foil that corrodes aluminum foil, the performance of carbon foil is greatly improved. The capacitance is several times higher than that of aluminum foil, and the impedance and loss value are small, but the manufacturing cost is high and the production efficiency is low. Solid capacitor with small size, long life and good thermal stability

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