Aluminium foil for electrolytic capacitor low-voltage anode use and producing method thereof

Abstract

A method for preparing AI foil used on low voltage positive electrode of electrolytic capacitor uses weight compositions with 99.980-99.993% of AI, 15-50ppm of Si, 15-50ppm of Fe, 20-60ppm of Cu, 10-15ppm trace amount element of Mg + Mn +Zn +Ga, impurities and allowance as materials to prepare AI foil used on low voltage positive electrode of electrolytic capacitor.

Description

technical field [0001] The present invention relates to an aluminum foil product, more specifically, the present invention relates to an aluminum foil for an anode in an electrolytic capacitor and a production method thereof. Background technique [0002] In recent years, as the electronic information technology industry continues to develop in the direction of high performance, miniaturization, and integration, the requirements for miniaturization and light weight of aluminum electrolytic capacitors are also increasing. For this reason, there is a demand for an aluminum foil for anodes that has a high electrostatic capacity, can be wound at a high speed under a small curvature radius, and has excellent mechanical strength. [0003] In terms of capacitance, according to the parallel plate capacitor capacitance formula C=εS / d, the capacitor capacitance C is proportional to the surface area S and dielectric constant ε of the electrode, and inversely proportional to the electro...

AI Technical Summary

Problems solved by technology

High-purity aluminum anode foil has the advantage of uniform corrosion due to less impurities on the surface, but it also has the disadvantages of slow corrosion rate, low foil strength, and high production cost.

Especially for thinner anode foil, if the foil is not strong enough, it cannot be corroded on the machine normally, and it is easy to break and the production efficiency is low

Moreover, if the purity of aluminum cannot be ensured, the error of the contained impurities will cause a deviation in the dissolution mechanism of aluminum during corrosion, and it will not be possible to obtain a stable area expansion rate and excellent mechanical strength.