Abstract: An electrolytic copper foil includes a copper foil body; and a IIA-group metal adhered to a surface of the copper foil body, wherein a signal strength of the IIA group metal is greater than 0.1% based on a signal strength of copper element as 100% analyzed by a secondary ion mass spectrometer. The present invention also provides a method for cleaning copper foil and a cleaning fluid composition which is used in the cleaning method.

Abstract: An electrolytic copper foil, which is particularly suitable for the application of a lithium ion secondary battery, has a shiny side and a matte side with a roughness of less than 2 ?m. Based on the total sum of the texture coefficients of a (111) surface, a (200) surface, a (220) surface and a (311) surface of the electrolytic copper foil, the sum of the texture coefficients of the (220) surface and the (311) surface of the electrolytic copper foil is greater than 60%.

Abstract: The present invention provides a method for producing a porous copper foil. The method of the present invention includes the steps of forming an oxide film by providing a chromium-containing compound to a metal surface of a cathode; forming a copper foil on the oxide film by performing electrolysis of copper; and removing the copper foil from the metal surface of the cathode. The method of the present invention is simple and time-saving, and the porous copper foil of the present invention has reduced roughness difference between both sides of the porous copper foil.