ALUMINUM ALLOY HARD THIN FOIL FOR SECONDARY BATTERY CATHODE COLLECTOR, SECONDARY BATTERY CATHODE COLLECTOR, AND METHOD FOR MANUFACTURING ALUMINUM ALLOY HARD THIN FOIL

摘要

A foil is manufactured as an aluminum alloy hard thin foil, wherein the aluminum alloy hard thin foil has an alloy composition wherein a content of Fe is 0.05 to 2.0% by mass, with the balance being aluminum and inevitable impurities; a recrystallization completion temperature is 250° C. or less; and a foil thickness of 5 to 50 μm. The aluminum alloy hard thin foil can be obtained by subjecting an aluminum alloy having, for example, a composition wherein a total content of Cu, Mg, Cr and Zr is 0.05% by mass or less, and a content of Mn is 0.05% by mass or less to intermediate annealing once or more during cold rolling and subjecting the resulting alloy to cold rolling wherein a reduction ratio from after final intermediate annealing to after final cold rolling is 85% or more.