| 摘要 |
PROBLEM TO BE SOLVED: To increase capacitance and improve break resistance by cladding an Al reinforced layer that has an Al layer with a specific purity or higher, at the same time contains a specific amount of Sc, and has a remaining part being made of an unavoidable impurity onto at least one layer. SOLUTION: In Al foil for electrolytic capacitor electrode, an Al-clad material is subjected to foil rolling, Al purity is set to 99.8 wt.% or higher, at the same time Sc that is 5 ppm or higher and less than 2,000 ppm is contained, and a high-purity Al with an Al purity of 99.8 wt.% is clad on at least one surface of a reinforced surface where a remaining part is made of an unavoidable impurity. Or, an Al concentration is set to 99.8% or higher. At the same time, Sc that is 5 ppm or higher and less than 2,000 ppm, Fe that is 5-60 ppm, Si that is 5-80 ppm, and Cu that is 5-150 ppm are contained, and an etching layer made of high-purity Al with an Al purity of 99.8% or higher is clad onto at least one surface of the reinforced layer where a remaining part is made of an unavoidable impurity, thus improving a surface-spread rate and achieving both improved capacitance and strength.
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