ELECTROLYTIC COPPER FOIL ELECTROLYTIC COPPER FOIL FOR LITHIUM ION SECONDARY BATTERY ELECTRODE FOR LITHIUM ION SECONDARY BATTERY USING THE ELECTROLYTIC COPPER FOIL AND LITHIUM ION SECONDARY BATTERY USING THE ELECTRODE

摘要

In a lithium ion secondary battery using a negative electrode in which an active material is deposited on a current collector, wrinkles do not occur on the current collector, no breakage of the current collector occurs, adhesion between the active material and the current collector is high, And an object of the present invention is to provide an electrode for the secondary battery and an electrolytic copper foil constituting the electrode. The surface roughness (Rz) of the roughened surface layer of both surfaces is set so that the surface roughness of the roughened surface of the copper foil and the surface roughness of the roughened surface of the copper foil, Of 1.0 to 5 占 퐉 and Ra of 0.25 to 0.7 占 퐉, wherein the difference in the roughness (Rz) between the front and back surfaces is within 3 占 퐉 and the difference in Ra is within 0.3 占 퐉.