The double-sided glossy copper foil is bright on both sides Electrolytic copper foil 。
At present, double-sided copper foil is mainly used for negative collector of lithium batteries (and power batteries). The production of double-sided glossy copper foil is mainly realized by adding brightener.
Traditionally, the double-sided glossy copper foil also has a smooth surface and a rough surface, but it is difficult for users to distinguish between them. The smooth surface of the double-sided glossy copper foil is still attached to the cathode roll, and the rough surface is still the surface that is in direct contact with the electrolytic copper, just because the addition of brightener makes the rough surface bright. It is sometimes impossible to judge the smooth surface and rough surface from the roughness, because the roughness of the rough surface of copper foil produced by some companies is equal to or slightly lower than the smooth surface.
