Electrolytic copper foil and method for producing the same, current collector for lithium secondary battery including the electrolytic copper foil, and lithium secondary battery

摘要

The electrolytic copper foil according to one embodiment of the present invention is an electrolytic copper foil applied as a current collector for a lithium secondary battery, and the electrolytic copper foil is 5.0 to when annealed at 190 ° C. for 1 hour. Having a fracture characteristic coefficient (f) falling within the range of 18.0, wherein the fracture characteristic coefficient (f) is defined by f = {(C−B) / A} × 1000, and A is In the tensile test for the electrolytic copper foil, the stress of the electrolytic copper foil is shown when the electrolytic copper foil starts to break, B shows the stretch ratio when the electrolytic copper foil starts to break, and C shows the electrolysis Indicates the stretch rate at the time when the copper foil rupture ends, and the time when the electrolytic copper foil rupture begins corresponds to the time when the stress that has increased with the increase in the stretch rate of the electrolytic copper foil begins to decrease in the tensile test. And when the breakage of the electrolytic copper foil ends, Kaidohaku corresponds to the time it is separated into two or more are destroyed.