Copper foil free from generation of wrinkles, electrode comprising the same, secondary battery comprising the same and method for manufacturing the same

1. A copper foil comprising:

a copper layer having a matte surface and a shiny surface; and

an anticorrosive layer disposed on the copper layer,

wherein the copper foil has a residual stress of 0.5 to 25 Mpa, based on absolute value, and

the copper layer has a plurality of crystal planes,

wherein a ratio [TCR(220)] of a texture coefficient (TC) of (220) crystal plane of the copper layer to a total of texture coefficients (TC) of (111), (200), (220) and (311) crystal planes of the copper layer is 5 to 30%,

wherein the copper foil has an elongation of 2 to 20% after heat-treatment at 130° C. for 30 minutes and

wherein the residual stress is measured in the (311) crystal plane.

2. The copper foil according to claim 1 , wherein the copper foil has a first surface corresponding to the direction of the matte surface and a second surface corresponding to the direction of the shiny surface,

wherein a difference in surface roughness (Ra) between the first surface and the second surface is 0.5 μm or less.

3. The copper foil according to claim 1 , wherein the copper foil has a thickness of 4 to 20 μm.

4. The copper foil according to claim 1 , wherein the anticorrosive layer comprises at least one of chromium, a silane compound or a nitrogen compound.

5. An electrode for secondary batteries comprising:

a copper foil; and

an active material layer disposed on the copper foil,

wherein the copper foil is the copper foil according to claim 1 .

6. A secondary battery comprising:

a cathode;

an anode facing the cathode;

an electrolyte disposed between the cathode and the anode to provide an environment enabling lithium ions to move; and

a separator to electrically insulate (isolate) the cathode from the anode,

wherein the anode comprises:

the copper foil according to claim 1 ; and

an active material layer disposed on the copper foil.