Copper foil with minimized bagginess, wrinkle or tear, electrode including the same, secondary battery including the same and method for manufacturing the same
Disclosed is a copper foil including a copper layer and having a tensile strength of 29 to 65 kgf/mm 2 , a mean width of roughness profile elements (Rsm) of 18 to 148 μm and a texture coefficient bias [TCB(220)] of 0.52 or less.
1. A copper foil comprising a copper layer and having a tensile strength of 29 to 65 kgf/mm 2 , a mean width of roughness profile elements (Rsm) of 18 to 148 μm and a texture coefficient bias [TCB(220)] of 0.52 or less.
2. The copper foil according to claim 1 , further comprising an anticorrosive film disposed on the copper layer.
3. The copper foil according to claim 2 , wherein the anticorrosive film comprises at least one of chromium (Cr), a silane compound and a nitrogen compound.
4. The copper foil according to claim 1 , wherein the copper foil has a maximum height roughness (Rmax) of 0.6 μm or more.
5. The copper foil according to claim 1 , wherein the copper foil has a weight deviation of 5% or less.
6. The copper foil according to claim 1 , wherein the copper foil has an elongation of 2% or more at a room temperature of 25±15° C.
7. The copper foil according to claim 1 , wherein the copper foil has a thickness of 4 μm to 30 μm.
8. An electrode for secondary batteries comprising:
the copper foil according to claim 1 ; and
an active material layer disposed on the copper foil.
9. 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 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.
10. A flexible copper foil laminate film comprising:
a polymer membrane; and
the copper foil according to claim 1 disposed on the polymer membrane.
11. A method for manufacturing a copper foil comprising applying a current density of 30 to 80 A/dm 2 to a electrode plate and a rotary electrode drum spaced from each other in an electrolyte containing copper ions to form a copper layer,
wherein the electrolyte comprises:
70 to 100 g/L of copper ions;
80 to 130 g/L of sulfuric acid;
2 to 20 mg/L of 2-mercaptothiazoline;
2 to 20 mg/L of bis-(3-sulfopropyl) disulfide (SPS); and
50 mg/L or less of polyethylene glycol (PEG).
12. The method according to claim 11 , wherein the electrolyte comprises 10 to 30 mg/L of chlorine (Cl).
13. The method according to claim 11 , wherein the electrolyte has a deviation of flow rate per unit time (second) of 5% or less.