Patent ID: 8349518

Claim:
A copper foil for a current collector of a lithium secondary battery, wherein, in a crystalline structure, a ratio of a sum of texture coefficients of a ( 111 ) surface and a ( 200 ) surface to a total sum of texture coefficients of the ( 111 ) surface, the ( 200 ) surface and a ( 220 ) surface is 60 to 85%, a ratio of a texture coefficient of the ( 111 ) surface to the total sum of texture coefficients of the ( 111 ) surface, the ( 200 ) surface and the ( 220 ) surface is 18 to 38%, a ratio of the texture coefficient of the ( 200 ) surface to the total sum of texture coefficients of the ( 111 ) surface, the ( 200 ) surface and the ( 220 ) surface is 28 to 62%, and a ratio of the texture coefficient of the ( 220 ) surface to the total sum of texture coefficients of the ( 111 ) surface, the ( 200 ) surface and the ( 220 ) surface is 15 to 40%, wherein the texture coefficient satisfies the following equation: TC ⁡ ( hkl ) = I ⁡ ( hkl ) I 0 ⁡ ( hkl ) 1 n ⁢ ∑ I ⁡ ( hkl ) I 0 ⁡ ( hkl ) where I(hkl) represents a measured diffraction intensity with respect to a (hkl) surface, and I 0 (hkl) represents a standard diffraction intensity of ASTM (American Society of Testing Materials) standard powder-shaped diffraction data, wherein the copper foil has a surface roughness (R z -JIS) of 2 μm or less, wherein the copper foil has a weight deviation of 3% or less, wherein the copper foil has a tensile strength of 30 to 40 kgf/mm 2 , wherein the copper foil has an elongation of 3 to 20%, and wherein the copper foil has a thickness of 1 to 35 μm.