Abstract: It is an object to provide an aluminum alloy foil for an electrode current collector, the foil having a high post-drying strength after application of an active material while keeping a high electrical conductivity. Disclosed is an aluminum alloy foil for an electrode current collector, comprising 0.1 to 1.0 mass % (hereinafter, “mass %” is simply referred to as “%”) of Fe, 0.01 to 0.5% of Si, and 0.01 to 0.2% of Cu, with the rest consisting of Al and unavoidable impurities, wherein the aluminum alloy foil after final cold rolling has a tensile strength of 220 MPa or higher, a 0.2% yield strength of 180 MPa or higher, and an electrical conductivity of 58% IACS or higher; and the aluminum ally foil has a tensile strength of 190 MPa or higher and a 0.2% yield strength of 160 MPa or higher even after the aluminum alloy foil is subjected to heat treatment at any of 120° C. for 24 hours, 140° C. for 3 hours, and 160° C. for 15 minutes.

Abstract: It is an object to provide an aluminum alloy foil for an electrode current collector, the foil having a high post-drying strength after application of an active material while keeping a high electrical conductivity. Disclosed is an aluminum alloy foil for an electrode current collector, comprising 0.03 to 0.1 mass % (hereinafter, “mass %” is simply referred to as “%”) of Fe, 0.01 to 0.1% of Si, and 0.0001 to 0.01% of Cu, with the rest consisting of Al and unavoidable impurities, wherein the aluminum alloy foil after final cold rolling has a tensile strength of 180 MPa or higher, a 0.2% yield strength of 160 MPa or higher, and an electrical conductivity of 60% IACS or higher; and the aluminum alloy foil has a tensile strength of 170 MPa or higher and a 0.2% yield strength of 150 MPa or higher even after the aluminum alloy foil is subjected to heat treatment at any of 120° C. for 24 hours, 140° C. for 3 hours, and 160° C. for 15 minutes.

Abstract: There is provided a current collector for use in a secondary battery on which active material coated on both sides of a metal foil are difficult to drop out. The metal foil is provided with a large number of penetrating holes, the periphery of which are formed into a complicated shape, and active material, binder, etc. are intruded on each periphery, whereby the active material, etc. coated on both sides of the current collector consisting of the metal foil are prevented from dropping out. An area S of penetrating holes is in the range of 0.05 to 0.50 mm2 a value M/N is in the range of 1.30 to 100 wherein M is the peripheral length of the penetrating holes and N is the peripheral length of a virtual circle having the area S of the penetrating hole. The current collector having such a large number of penetrating holes is obtained by passing a metal foil without a hole through between a concavo-convex roll having a large number of convex parts and a smoothing roll.