Double layered electrolytic copper foil and manufacturing method thereof
AssigneeVolta Energy Solutions S.A.R.L.
InventorsHonggi Moon, Sangbeom Kim, Seunghwan Kim
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Abstract
A double layered electrolytic copper foil is disclosed. It is possible to freely control various physical properties of the double layered electrolytic copper foil. The double layered electrolytic copper foil contains a first copper layer, a second copper layer, and an interface formed between one surface of the first copper layer and one surface of the second copper layer. A method of manufacturing the double layered electrolytic copper foil is also disclosed.
Claims15
A double layered electrolytic copper foil comprising:
- a first copper layer;
- a second copper layer;
- and
- an interface formed between one surface of the first copper layer and one surface of the second copper layer,
- wherein the first copper layer and the second copper layer have different grain sizes or different crystal structures from each other,
- an elongation of the double layered electrolytic copper foil is in a range from 3.0 to 25%, and
- a tensile strength of the double layered electrolytic copper foil is in a range from 30 to 40 kgf/mm2.
A method of manufacturing a double layered electrolytic copper foil by applying a current between an anode and a rotating cathode drum spaced apart from each other in an electrolytic bath in which an electrolyte is accommodated, the method comprising:
- a first step of electrodepositing a first copper layer on the rotating cathode drum by applying a current to the electrolyte;
- and
- a second step of electrodepositing a second copper layer on the first copper layer by applying a current to the electrolyte,
- wherein at least one of a concentration of copper ions comprised in the electrolyte, a current density, an electrolyte agitation, and an electrolyte temperature is different from each other between the first step and the second step,
- the first copper layer and the second copper layer have different grain sizes or different crystal structures from each other,
- an elongation of the double layered electrolytic copper foil is in a range from 3.0 to 25%, and
- a tensile strength of the double layered electrolytic copper foil is in a range from 30 to 40 kgf/mm2.
Dependencies are inferred from the claim text.