High-voltage-resistant solid aluminum electrolytic capacitor and preparation method thereof

Abstract

A high-voltage-resistant solid aluminum electrolytic capacitor comprises a shell, a core package and a rubber plug; the core package is arranged in the shell in a sealed mode through the rubber plug; the core package is formed by winding an anode foil, electrolytic paper and a cathode foil, a polymer conductive gel film is formed between the anode foil and the cathode foil, and the polymer conductive gel film comprises gel formed by starch; and the weight of the starch accounts for 20-50% of the weight of the high-molecular conductive polymer. According to the invention, a certain amount of starch is added into a dispersion liquid, the starch and PEDOT: PSS are dried together to form a layer of polymer conductive gel between the anode foil and the cathode foil, and under the effect of the gel, even if leakage current exists on the surface of the anode foil, the voltage withstanding value of the polymer conductive gel is increased, and further, the withstand voltage value of the solid aluminum electrolytic capacitor is improved.

Description

technical field [0001] The invention relates to an aluminum electrolytic capacitor, in particular to a high-voltage-resistant solid aluminum electrolytic capacitor and a preparation method thereof. Background technique [0002] Compared with liquid aluminum electrolytic capacitors, solid aluminum electrolytic capacitors have no electrolyte, so there is no possibility of electrolyte leakage, and their safety performance is unmatched by liquid aluminum electrolytic capacitors. However, since there is no electrolyte in solid aluminum electrolytic capacitors, the damage to the anode foil on the surface of the anode foil cannot be repaired during the manufacturing process. Therefore, the biggest problem with solid aluminum electrolytic capacitors is the large leakage current. Because the oxide film on the surface of the anode foil cannot be effectively repaired in the solid aluminum electrolytic capacitor, the high voltage resistance performance of the solid aluminum electrolytic...

AI Technical Summary

Problems solved by technology

However, since there is no electrolyte in solid aluminum electrolytic capacitors, the damage to the anode foil on the surface of the anode foil cannot be repaired during the manufacturing process. Therefore, the biggest problem with solid aluminum electrolytic capacitors is the large leakage current. The high voltage resistance of solid aluminum electrolytic capacitors is relatively poor because the oxide film on the surface of the anode foil cannot be effectively repaired.

[0003] The current high-voltage (50-100V) solid aluminum electrolytic capacitors on the market have obvious insufficient withstand voltage values, and it is easy to cause short circuits during use, which cannot meet the needs of the market.