Electrolytic copper foil for lithium secondary battery and lithium secondary battery comprising the same
An electrolytic copper foil for a lithium secondary battery has yield strength of 30 kgf/mm 2 to 60 kgf/mm 2 , a surface area ratio of 1 to 3, and a weight deviation of 3% or below.
1. An electrolytic copper foil for a lithium secondary battery, which is applied as a negative electrode current collector of a lithium secondary battery,
wherein the electrolytic copper foil for a lithium secondary battery has yield strength of 30 kgf/mm 2 to 60 kgf/mm 2 , a surface area ratio of 1 to 3, and a weight deviation of 3% or below.
2. The electrolytic copper foil for a lithium secondary battery according to claim 1 ,
wherein the electrolytic copper foil for a lithium secondary battery has a surface roughness of 0.2 μm to 2 μm on the basis of Rz.
3. The electrolytic copper foil for a lithium secondary battery according to claim 1 ,
wherein the electrolytic copper foil for a lithium secondary battery has an elongation of 3% or above.
4. The electrolytic copper foil for a lithium secondary battery according to claim 1 ,
wherein the electrolytic copper foil for a lithium secondary battery has a thickness of 3 μm to 30 μm.
5. A lithium secondary battery, in which the electrolytic copper foil for a lithium secondary battery according to claim 1 is applied as a negative electrode current collector.