Aluminum alloy hard thin foil for secondary battery positive electrode current collector, secondary battery positive current collector and method for producing aluminum alloy hard thin foil

摘要

Aluminum with an alloy composition in which the content of Fe is 0.05 to 2.0% by mass, the balance is Al and unavoidable impurities, the recrystallization completion temperature is 250 ° C. or less, and the foil thickness is 5 to 50 μm For example, the aluminum alloy hard thin foil has a composition in which the total content of Cu, Mg, Cr, and Zr is 0.05% or less by mass%, and the Mn content is 0.05% or less The aluminum alloy can be obtained by performing one or more intermediate annealings in the middle of cold rolling, and performing cold rolling with a rolling reduction of 85% or more after final intermediate annealing to after final cold rolling.