ALUMINUM ALLOY HARD THIN FOIL FOR SECONDARY BATTERY POSITIVE ELECTRODE CHARGE COLLECTOR, SECONDARY BATTERY POSITIVE ELECTRODE CHARGE COLLECTOR, AND PRODUCTION METHOD FOR ALUMINUM ALLOY HARD THIN FOIL

摘要

This aluminum alloy hard thin foil has an alloy composition makeup in which the contained amount of Fe is 0.05-2.0% by mass and the remaining portion is Al and incidental impurities, and has a recrystallization finishing temperature of 250°C or less and a foil thickness of 5-50 μm, wherein the aluminum alloy hard thin foil can be obtained, for example, by subjecting an aluminum alloy having a compositional makeup in which the total contained amount Cu, Mg, Cr, and Zr is not more than 0.05% by mass and the contained amount of Mn is not more than 0.05% by mass, to cold rolling in which intermediate annealing is performed at least once halfway through the cold rolling, and in which the pressure reduction rate from after the final intermediate annealing to after the final cold rolling is 85% or more.