Formation method of high-specific-volume, high-flexibility and low-electric-leakage electrode foil

Abstract

The invention discloses a formation method of a high-specific-volume, high-flexibility and low-electric-leakage electrode foil. The formation method comprises first-grade formation, second-grade formation, third-grade formation, fourth-grade formation and fifth-grade formation of an aluminum foil, wherein the first-grade formation of the aluminum foil is performed in water solution containing azelaic acid and ammonium azelaic acid; the second-grade formation is performed in water solution containing azelaic acid, ammonium azelaic acid and boric acid; the third-grade formation is performed in water solution containing lemons, boric acid and ammonium azelaic acid; and the fourth-grade formation and the fifth-grade formation are both performed in water solution containing boric acid and ammonium pentaborate. The electrode foil manufactured by using the method is high in specific volume, high in bending strength and low in electric leakage; and the quality of the electrode foil is effectively improved.

Description

technical field [0001] The invention belongs to the field of electrode foil production, and in particular relates to a method for forming an electrode foil with high specific volume, high bending and low leakage current. Background technique [0002] The current manufacturing method of the electrode foil for medium and high voltage aluminum electrolytic capacitors is as follows: immerse the corroded aluminum foil with a purity of 99.99wt% in pure water at 95-100°C for 10 minutes; take it out and place it in 0.1 In the aqueous solution of the azelaic acid of wt% and the ammonium azelate of 2wt%, under the conditions of 85 ℃, current density of 20mA / cm2, and voltage of 200v, the first-order formation is 18min; then placed in 7wt% of boric acid and 0.4 In the aqueous solution of wt% ammonium pentaborate, under the conditions of 85°C, current density of 20mA / cm2, and voltage of 430v, secondary conversion was performed for 18min; then placed in the aqueous solution of 7wt% boric ...

AI Technical Summary

Problems solved by technology

Using this manufacturing method of electrode foil, the process requires high current density, high energy consumption, and low production efficiency, and the electrode foil manufactured by the above manufacturing method has low specific volume, low bending strength and large leakage.