Patent Number: 7,612,986

Title: Aluminum plate for aluminum electrolytic capacitor electrode, aluminum electrolytic capacitor, and method for manufacturing aluminum electrolytic capacitor

Abstract: An aluminum plate having an aluminum purity of not less than 99.98% by mass and an Fe content of 5 to 50 ppm with the balance consisting of unavoidable impurities is used to realize increased capacitance of an aluminum electrolytic capacitor, reduced height, and improved high frequency characteristics. In this aluminum plate, the total content of Fe in crystal/precipitate is 1 to 50% based on the original content, and the thickness of the aluminum plate 0.2 to 1 mm. In the formation of a capacitor anode, the aluminum plate is subjected to alternate current etching so as to leave a core part having an average thickness of 50 to 150 .mu.m in the center part in the thickness-wise direction to increase the surface area, followed by anodic oxidation.

Inventors: Katano; Masahiko (Ihara-gun, JP), Isobe; Masashi (Ihara-gun, JP), Arai; Shinichi (Tokyo, JP)

Assignee: Nippon Light Metal Company, Ltd.

International Classification: H01G 9/00 (20060101)

Expiration Date: 1/03/02017