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Cathode foil producing process for electrolytic capacitor

An electrolytic capacitor and preparation process technology, applied in the field of negative electrode foil, can solve the problems such as the deterioration of capacity, leakage current and impedance and other characteristics, reduce titanium adhesion and other problems, and achieve the effect of ensuring normal functioning, avoiding deterioration and improving capacity

Inactive Publication Date: 2009-05-06
DONGGUAN HEC CONDENSER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is a problem with titanium plating on the surface of aluminum foil, that is, the joint between titanium and aluminum in the air is easily affected by aluminum oxidation, which reduces the adhesion of titanium on the surface of aluminum foil, thereby causing its capacity, leakage current and impedance, etc. Rapid deterioration of characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The foil used in this embodiment is a 22 μm hard light foil, and the Al% (mass percentage) is ≥ 98%. The above-mentioned foil is washed in 0.3mol / L sodium hydroxide solution at 50°C for 10 seconds, and then subjected to electron beam evaporation treatment. The thickness of the titanium metal coating layer is in the range of 0.5-1 μm, and the foil is immersed in the silane coupling agent solution Immerse in the medium for 10S, the silane coupling agent used is KBM-602, its aqueous solution concentration is 0.1%, and then dried in an oven at 80°C for about 30 minutes. The silane coupling agent undergoes a polymerization reaction during the drying and curing process to form a protective layer of silica gel, and a protective layer of silica gel is formed on the outer surface of the foil plated with a titanium metal film, that is, a negative electrode foil for electrolytic capacitors is formed. The initial measured specific volume is 513μF / cm 2 , the specific volume after s...

Embodiment 2

[0019] The foil used in this embodiment is a 22 μm hard light foil, and the Al% (mass percentage) is ≥ 98%. The above-mentioned foil is washed in 0.3mol / L phosphoric acid solution at 50°C for 10 seconds, and then subjected to electron beam evaporation treatment. The thickness of the titanium metal coating layer is in the range of 0.5-1 μm, and the foil is immersed in the silane coupling agent solution. 10S, the grade of silane coupling agent used is KBM-602, the concentration of its aqueous solution is 0.1%, and the pH value is adjusted to 5.0 with glacial acetic acid. Dry in the oven for about 30 minutes. The silane coupling agent undergoes a polymerization reaction during the drying and curing process to form a protective layer of silica gel, and a protective layer of silica gel is formed on the outer surface of the foil plated with a titanium metal film, that is, a negative electrode foil for electrolytic capacitors is formed. The initial measured specific volume is 553μF / ...

Embodiment 3

[0021] The foil used in this embodiment is a 22 μm hard light foil, and the Al% (mass percentage) is ≥ 98%. The above-mentioned foil is washed in 0.3mol / L phosphoric acid solution at 50°C for 10 seconds, and then subjected to electron beam evaporation treatment. The thickness of the titanium metal coating layer is in the range of 0.5-1 μm, and the foil is immersed in the silane coupling agent solution. 10S, the grade of silane coupling agent used is KBM-602, and the concentration of its aqueous solution is 0.5%. The above-mentioned titanium-plated foil is placed in the silane coupling agent solution and immersed for 20S, and then dried in an oven at 90°C for about 40 minute. The silane coupling agent undergoes a polymerization reaction during the drying and curing process to form a protective layer of silica gel, and a protective layer of silica gel is formed on the outer surface of the foil plated with a titanium metal film, that is, a negative electrode foil for electrolytic...

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Abstract

The invention relates to the technical field of cathode foil, in particular to a preparation technology of cathode foil for electrolytic capacitors, which comprises the following steps of cleaning foil, coating a titanium metal film, dipping, drying and solidification. A layer of titanium metal film is coated on the foil to greatly increase the dielectric constant Epsilon of the dielectric layer of the cathode foil, which is 5 to 15 times larger than that of the prior art, and the capacity of the cathode foil can be substantially improved under the same specific surface condition; In addition, a silane coupling agent after being solidified and treated forms a layer of protective layer on the surface of the titanium metal layer to separate the oxygen in air from the aluminum foil, thereby the deterioration action caused by the oxidation of aluminum is avoided, the stability of the titanium metal film in air is improved so as to ensure that the titanium metal film is in working order.

Description

Technical field: [0001] The invention relates to the technical field of negative electrode foils, in particular to a preparation process of negative electrode foils for electrolytic capacitors. Background technique: [0002] Aluminum electrolytic capacitors are a class of electronic components widely used in the electronics industry. The miniaturization and weight reduction requirements of electronic products force capacitors to develop in the direction of miniaturization and weight reduction. From the perspective of the structure of aluminum electrolytic capacitors, the capacitor is composed of anode foil, negative electrode foil and electrolyte that repairs the oxide film. The calculation formula of its capacity (c+ is the capacity of the anode foil, c- is the capacity of the negative electrode foil) is as follows : [0003] c=c + c - / (c + +c - ). [0004] It can be seen that the capacity of the capacitor is determined by the capacity of the anode foil and the nega...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G9/04H01G9/045C23G1/00C23C14/26C23C14/16
Inventor 江国东
Owner DONGGUAN HEC CONDENSER CO LTD
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