Abstract
With the rapid development of new energy vehicles, the requirements of high elongation and high conductivity are put forward for lithium battery copper foil. In this paper, the typical 6 ÎĽm lithium battery copper foil of four enterprises is taken as the research object, and the morphology, structure, and performance of lithium battery copper foil are studied. The results show that the surface condition of the cathode roll affects not only the brightness of the copper foil but also the mechanical properties of the copper foil. The copper foil with low residual stress can be obtained by controlling the grain size at a low level so that the proportion of the (220) crystal plane is much smaller than that of the (200) crystal plane. As the grain size of copper foil decreases, the tensile strength and elongation of copper foil gradually increase. The increase in the proportion of the (111) crystal plane increases the elongation, and the increase in the proportion of the (220) crystal plane increases the tensile strength. Thus, the basis for adjusting the performance of copper foil is determined, which lays a theoretical foundation for the subsequent study of the electrodeposition copper foil process.

Key words
lithium battery copper foil, roughness, microstructure, crystal orientation, performance

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