Study on the relationship between crystal plane orientation and strength of electrolytic copper foil

For lithium-ion batteries (LIBs), the current collectors are indispensable components for loading electrode materials. The electrolytic copper foils with different tensile strength were selected to study the strengthening mechanism of copper foil. Through refining crystal grains and strengthen the crystal orientation of copper foils, the tensile strength can be considerably improved. For normal strength copper foil, the crystal orientation is (200) plane and the average grain size is 1.428 µm. For high strength and super strength copper, the crystal orientation are both (220) plane, and the average grain sizes are 1.09 µm and 862 nm. Moreover, the influence mechanism of texture to strength was studied by characterizing the dislocation density of the copper foils. Through which, the dislocations and substructures inside the crystal grains that produced by the release of residual internal stress can be observed, and the deformation of the crystal grains can be hindered during a stretch process.