Novel composite additives to prepare ultra-thin nanotwin copper foil with high toughness

The properties of copper foil are crucial in lithium batteries, making the study of electroplating additives essential for the preparation of high-performance copper foil. In our research, we selected Pluronic F-127 and DPS (N, N-dimethyldithioformamide propane sulfonate) as additives in the plating solution to examine their effects on the surface roughness and tensile strength of 8 μm ultra-thin lithium battery copper foil. The results indicated that the copper foil grains were significantly refined under the synergistic influence of the composite additive Pluronic F-127 and DPS. This refinement enhanced the texture orientation of the copper foil (220),characteristic of the FCC crystal structure of the Cu-α phase and resulted in excellent performance, including high tensile strength (616.42 MPa), high elongation (7.69 %), and low surface roughness (0.393 μm).