| abstract |
An object of the present invention is to provide a thin, high strength, high adhesion to an active material, a metal foil, a method for producing a metal foil, a negative electrode for a secondary battery, and a positive electrode for a secondary battery. Thickness of 5μm or more and less than 100μm, copper foil, silver foil, gold foil, platinum foil, stainless steel foil, titanium foil, tantalum foil, molybdenum foil, niobium foil, zirconium foil, tungsten foil, beryllium copper foil, phosphor bronze foil, brass Foil, silver foil, tin foil, zinc foil, iron foil, nickel foil, permalloy foil, nichrome foil, 42 alloy foil, Kovar foil, Monel foil, Inconel foil, and Hastelloy foil, or A foil selected from this group and a metal foil formed by laminating a metal of a different kind from the selected foil have a surface area ratio ΔS of 2% or more. |