Provided is a rolled copper foil for a lithium ion battery current collector, which has good adhesion to a negative electrode active material, generates less metal powder during ultrasonic welding, and has a rust prevention property. In the rolled copper foil for a lithium ion battery current collector, a surface of the copper foil has a BTA film, the BTA film has a thickness of 0.6 nm or more and 4.6 nm or less, and the rolled copper foil satisfies the following relationships: 40?wet tension [mN]/m]+thickness of BTA film [nm]?10?80; 0.01?arithmetic average roughness Ra [?m]?0.25; and wet tension [mN/m]?35.

Provided is a rolled copper foil for a lithium ion battery current collector, which has good adhesion to a negative electrode active material, generates less metal powder during ultrasonic welding, and has a rust prevention property. In the rolled copper foil for a lithium ion battery current collector, a surface of the copper foil has a BTA film, the BTA film has a thickness of 0.6 nm or more and 4.6 nm or less, and the rolled copper foil satisfies the following relationships: 40?wet tension [mN]/m]+thickness of BTA film [nm]?10?80; 0.01?arithmetic average roughness Ra [?m]?0.25; and wet tension [mN/m]?35.

Provided is an austenitic stainless steel foil that demonstrates a high degree of stretch formability and little deformation anisotropy with respect to stretch forming despite having a sheet thickness of 60 m or less. The austenitic stainless steel foil of the present invention has a sheet thickness of 5 m to 60 m, a recrystallization rate of 90% to 100%, and a texture in which the total of the area ratio of a crystal orientation in which the difference in orientation from the {112}<111> orientation is within 10, the area ratio of a crystal orientation in which the difference in orientation from the {110}<112> orientation is within 10, and the area ratio of a crystal orientation in which the difference in orientation from the {110}<001> orientation is within 10, in a measuring field thereof, is 20% or less.

Provided is an austenitic stainless steel foil that demonstrates a high degree of stretch formability and little deformation anisotropy with respect to stretch forming despite having a sheet thickness of 60 m or less. The austenitic stainless steel foil of the present invention has a sheet thickness of 5 m to 60 m, a recrystallization rate of 90% to 100%, and a texture in which the total of the area ratio of a crystal orientation in which the difference in orientation from the {112}<111> orientation is within 10, the area ratio of a crystal orientation in which the difference in orientation from the {110}<112> orientation is within 10, and the area ratio of a crystal orientation in which the difference in orientation from the {110}<001> orientation is within 10, in a measuring field thereof, is 20% or less.

Discussed is an aluminum foil for ultraviolet light reflecting materials, wherein a ratio of a total surface area of aluminum particles pressed into or adhering to a region having a predetermined surface area to the surface area of the region is less than or equal to 0.05%, the total surface area of crystallized products present in the region having a predetermined surface area is less than or equal to 2% with respect to the surface area of the region, an average surface area per crystallized product is less than or equal to 2 ?m.sup.2, and arithmetic surface roughness Ra of the region is less than 20 nm.

Discussed is an aluminum foil for ultraviolet light reflecting materials, wherein a ratio of a total surface area of aluminum particles pressed into or adhering to a region having a predetermined surface area to the surface area of the region is less than or equal to 0.05%, the total surface area of crystallized products present in the region having a predetermined surface area is less than or equal to 2% with respect to the surface area of the region, an average surface area per crystallized product is less than or equal to 2 ?m.sup.2, and arithmetic surface roughness Ra of the region is less than 20 nm.

An aluminum-alloy foil that enables to satisfy both of high elongation and high strength even in the case of reducing the foil thickness. The chemical composition of the aluminum-alloy foil contains, in mass %, Fe: 1.0% or more and 2.0% or less, Cu: 0.1% or more and 0.5% or less, and Mn: 0.05% or less, the remainder being Al and unavoidable impurities. The aluminum-alloy foil has a foil thickness of 20 m or less, and satisfies the relation El100t/UTS. Here, t represents a foil thickness (m), UTS represents a tensile strength (MPa), and El represents an elongation (%).

An aluminum-alloy foil that enables to satisfy both of high elongation and high strength even in the case of reducing the foil thickness. The chemical composition of the aluminum-alloy foil contains, in mass %, Fe: 1.0% or more and 2.0% or less, Cu: 0.1% or more and 0.5% or less, and Mn: 0.05% or less, the remainder being Al and unavoidable impurities. The aluminum-alloy foil has a foil thickness of 20 m or less, and satisfies the relation El100t/UTS. Here, t represents a foil thickness (m), UTS represents a tensile strength (MPa), and El represents an elongation (%).

A device for manufacturing a lithium band including a rolling area including two rolling cylinders, a feed-in area including a device for feeding in the rolling area with a lithium band with a first thickness, a device for feeding in two films interposed between the lithium band with a first thickness and a rolling cylinder, and a storage area including a device for collecting a lithium band having a second thickness. The lithium band with a second thickness is tensioned and rolls ensure a separation of each film off the surface of one of the rolling cylinders in a separation area located beyond a horizontal plane passing through the axis of rotation of the rolling cylinder and located opposite to the other rolling cylinder.

A ratio of a total surface area of aluminum particles pressed into or adhering to a region having a predetermined surface area to the surface area of the region is less than or equal to 0.05%. The total surface area of crystallized products present in the region is less than or equal to 2% with respect to the surface area of the region. An average surface area per crystallized product is less than or equal to 2 ?m.sup.2. Surface roughness Ra of the region is less than 20 nm.