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US 2024/0194890 A1Published application
Copper foil, electrode comprising the same, secondary battery comprising the same, and method for manufacturing the same
AssigneeSK Nexilis Co., Ltd.
InventorsShan Hua JIN, Min Seok YOON
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Abstract
According one embodiment of the present disclosure, there is provided a copper foil including a copper film including 99.9 wt % or more of copper, and a protective layer formed on the copper film, wherein the copper foil has a tensile strength index of 3.0 kgf/mm2 or less, and an elongation index of 2.1% or less.
Claims9
A copper foil comprising:
- a copper film including 99.9 wt % or more of copper;
- and
- a protective layer formed on the copper film,
- wherein the copper foil has a tensile strength index of 3.0 kgf/mm2 or less, and an elongation index of 2.1% or less,
- wherein the tensile strength index is calculated by Equation 1 below,
- tensile strength index=|tensile strength 2−tensile strength 1| [Equation 1]
- wherein, tensile strength 1 in Equation 1 is a tensile strength of a sample before a salt spray test, and
- tensile strength 2 in Equation 1 is a tensile strength of the sample after the salt spray test
- the elongation index is calculated by Equation 2 below,
- elongation index=|elongation 2−elongation 1| [Equation 2]
- wherein elongation 1 in Equation 2 is an elongation of the sample before the salt spray test, and
- elongation 2 in Equation 2 is an elongation of the sample after the salt spray test, and
- the salt spray test is performed for a total of 72 hours by spraying a 5±1% NaCl solution on the copper foil for 6 cycles, wherein 1 cycle means that the NaCl solution is sprayed at a temperature of 35±2° C. for 2 hours and then is dried for 10 hours.
10 more elements
A method for manufacturing a copper foil, the method comprising:
- preparing an electrolyte containing copper ions;
- forming a copper film;
- and
- forming a protective layer on the copper film,
- wherein the forming of the copper film includes forming the copper film on a rotating anode drum by electrically conducting a cathode plate and the rotating anode drum, which are disposed to be spaced apart from each other in the electrolyte in an electrolytic bath, and
- the electrolyte includes:
- copper ions at a concentration of 70 g/L to 100 g/L;
- sulfuric acid at a concentration of 70 g/L to 150 g/L;
- chlorine (Cl) at a concentration of 15 ppm to 25 ppm;
- lead ions (Pb2+) at a concentration of 1 ppm to 100 ppm;
- arsenic (As) at a concentration of 0.5 ppm to 5 ppm;
- silver ions (Ag+) at a concentration of 0.1 ppm to 3 ppm;
- hydrogen peroxide at a concentration of 1 ml/L to 10 ml/L;
- and
- an organic additive,
- wherein the organic additive includes at least one of a polishing agent (component A), a moderator (component B), and a roughness regulator (component C),
- wherein the polishing agent (component A) includes sulfonic acid or a metal salt thereof,
- the moderator (component B) includes a non-ionic water-soluble polymer, and
- the roughness regulator (component C) includes a nitrogen-containing heterocyclic quaternary ammonium salt or a derivative thereof.
16 more elements
Dependencies are inferred from the claim text.