Preparation method of aluminum electrolytic capacitor anode foil composite film

Abstract

The invention relates to a preparation method of an aluminum electrolytic capacitor anode foil composite film. The method comprises the following steps: 1) preparing gel: uniformly mixing butyl titanate and water according to a molar ratio of 1: 8-1: 12, then adding a solvent, and uniformly mixing to obtain gel, wherein the solvent comprises one or more of glacial acetic acid, ethanol, ethylene glycol monomethyl ether or isopropanol; (2) soaking a sintered aluminum foil in the gel obtained in the step (1) for 2-5 minutes, taking out the sintered aluminum foil, and uniformly coating the gel; then drying at the temperature of 80-120 DEG C for 10 to 20 minutes, and sintering at the temperature of 500- 540 DEG C for 5-15 minutes; and 3) carrying out formation. According to the invention, butyl titanate is used as a raw material to prepare the gel, the gel is uniformly coated on the sintered aluminum foil and then hydrolyzed to form a continuous and uniform gel film, and then the Al2O3-TiO2 composite film is formed on the sintered aluminum foil through high-temperature sintering, and the film has the characteristic of a high dielectric constant so that the specific volume of the anode foil is improved.

Description

technical field [0001] The invention relates to an anode foil of an aluminum electrolytic capacitor, in particular to a preparation method of using sintered aluminum foil as a composite foil on the anode foil of an aluminum electrolytic capacitor. Background technique [0002] The anode foil used in traditional aluminum electrolytic capacitors requires a large amount of strong acid to corrode, which will cause many environmental problems, especially for high-voltage corrosion foils, which have high requirements for light foil materials, and are prone to over-corrosion, thereby reducing the mechanical properties of the aluminum foil. In order to improve these problems and further increase the capacitance, Japanese companies first proposed to prepare a powder sintered anode foil with a high specific surface by laminating and sintering aluminum powder on the light foil. However, under certain thickness conditions, the method can increase the capacitance by increasing the specif...

AI Technical Summary

Problems solved by technology

However, under certain thickness conditions, the method can increase the capacitance by increasing the specific surface area of ​​aluminum foil is limited.