Patent attributes
The present disclosure relates to a surface-treated copper foil which exhibits excellent affinity for an active material layer that is applied to the copper foil in the manufacture of a negative electrode (anode), for use in secondary lithium-ion batteries. The copper foil is plated with chromium and zinc and subsequently subjected to an organic treatment. The surface-treated copper has a surface tension of 34 to 58 dyne/cm and a surface roughness (Rz) of 0.8 to 2.5 μm, and comprises: (a) copper foil; (b) a zinc-chromium layer plated one or both sides of the copper foil, wherein the zinc content in the zinc-chromium layer is from 10 to 120 μg/dm2 and the chromium content in the zinc-chromium layer is from 10 to 35 μg/dm2; and (c) an organic hydrophobic layer applied to the zinc-chromium layer.
