COPPER FOIL, ELECTRODES COVERING THEM, SECONDARY BATTERIES COVERING THEM, AND METHODS OF MANUFACTURING THERE

Abstract

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.