SK Nexilis

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has an oxygen permeability of 0.7 cc/(m²·day·atm) or less. The oxygen permeability is measured using a permeability measuring device according to ASTM D3985.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has a thermal gravimetric coefficient of 1.1% or less. The thermal gravimetric coefficient is measured using a thermogravimetric analyzer (TGA) in an oxygen atmosphere, and is measured at a rate of 10°C/min from 25°C to 800°C.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has a maximum power difference of 1.5 mW or less. The maximum power difference is measured by differential scanning calorimetry (DSC) and is measured at a rate of 10°C/min from 20°C to 500°C, and means the difference between the maximum power value and the power value at room temperature.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has a thermal gravimetric coefficient of 1.005% or less. The thermal gravimetric coefficient is measured using a thermogravimetric analyzer (TGA) in a nitrogen atmosphere, and is measured at a rate of 10°C/min from 25°C to 800°C.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein when the boundary in which an orientation difference between adjacent pixels is 5° or more is considered as a grain boundary, the area ratio of crystal grains (including twins) having a high-temperature GOS value in the range of 0° or more and less than 2° is 45% to 93% of the total cross-sectional area. The high-temperature GOS value is measured for a cross-section of the copper foil using an electron backscatter diffraction (EBSD) pattern analyzer after the copper foil is heat-treated at 190°C for an hour.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein when the boundary in which an orientation difference between adjacent pixels is 5° or more is considered as a crystal grain boundary, the area ratio of crystal grains (including twins) having a room-temperature GOS value in a range of 0° or more and less than 2° is 45% to 95% of the total cross-sectional area. The room-temperature GOS value is measured at room temperature for a cross-section of the copper foil using electron backscatter diffraction (EBSD) pattern analyzer.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has a room-temperature GOS value in the range of 4° to 12°. The room-temperature GOS value is measured at room temperature for a cross-section of the copper foil using an electron backscatter diffraction (EBSD) pattern analyzer.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has an indentation creep rate of 2.0 to 6.0%. The indentation creep rate is measured using a nano-indenter.

One embodiment of the present disclosure provides a copper foil having a first surface and a second surface and including a copper film having a matte surface facing the first surface and a shiny surface facing the second surface; and a protective layer disposed on the copper film, wherein the copper foil has a specular reflectivity of 1.0 to 30.0 on the first surface. The specular reflectivity refers to a value obtained by subtracting a brightness index measured in a specular component excluded (SCE) mode from a brightness index measured in a specular component included (SCI) mode, and is measured using a colorimeter.

One embodiment of the present disclosure provides a copper foil including a copper film having a matte surface and a shiny surface; and a protective layer disposed on the copper film, wherein the copper foil has a compressive elastic strain index of 10 to 30 GPa. The compressive elastic strain index is measured using a nano-indenter.