ELECTROLYTIC COPPER FOIL CAPABLE OF PREVENTING TEARING OR WRINKLE DEFECTS, ELECTRODE CONTAINING SAME, SECONDARY BATTERY CONTAINING SAME, AND METHOD FOR MANUFACTURING SAME

One embodiment of the present disclosure provides an electrolytic copper foil includes a copper layer and has a width direction weight deviation of 5% or less calculated according to Equation 1 below, a tensile strength of 25 kgf/mmto 62 kgf/mm, and a valley depth-to-thickness (VDT) of 3.5 to 66.9 calculated according to Equation 2 below. width direction weight deviation (%)=(standard deviation of weight/arithmetic mean of weight)×100, and [Equation 1] VDT=[thickness of electrolytic copper foil]/[maximum valley depth of roughness profile()]. [Equation 2]