Preparation And Application Of Super-impregnated Copper Surfaces Based On Laser Micro/Nano Fabrication Technology

The wettability of solid surfaces is an important indicator of surface properties,including superhydrophobicity,superoleophobicity,superhydrophilicity and superoleophilicity.Copper,as a transition metal,has a wide range application due to its high ductility and its mechanical and electrical properties such as good electrical and thermal conductivity.At the same time,laser surface treatment technology has the characteristics of easy operation,high processing efficiency,low processing cost and green pollution-free,which makes it stand out among other surface treatment technologies.This research is dedicated to the processing of copper-based superimpregnated surfaces by nanosecond laser surface treatment technology,and to investigate its application in corrosion resistance and energy fields,and then to lay the theoretical foundation and technical support for the engineering application of copperbased super-impregnated surfaces.The specific research and findings are as follows.Nanosecond laser surface treatment technology was employed to produce a gridlike array structure on a pure copper surface.Using scanning electron microscopy and contact angle measurement,the laws of the laser surface treatment process on the twodimensional morphology,three-dimensional profile and different solution wettability of the copper surface were investigated.As the result of experiment,the laser ablation process causes a dramatic change in the roughness of the copper surface,resulting in a change in its surface wettability to water and ester electrolytes.The surface modification of copper surfaces processed by laser using the 1H,1H,2H,2H-perfluorodecyltriethoxysilane solutions resulted in superhydrophobic properties on the sample surfaces.Using scanning electron microscopy and X-ray photoelectron spectroscopy,the morphological changes and chemical composition changes of the surface of superhydrophobic copper surfaces after etching with alkali solutions were examined respectively,and the nature of the corrosion resistance of superhydrophobic materials was revealed from a molecular perspective.Finally,the dynamic polar curves and electrochemical impedance spectra of the surface were characterised by electrochemical tests.The mechanism by which the laser-processed surface achieves superhydrophobic properties and exhibited excellent resistance to alkali as well as to corrosion was further demonstrated.Assembly and testing of lithium-ion batteries using laser-processed copper as an anode collector.Experiments had demonstrated that after laser processing,a large amount of copper oxide and cuprous oxide was produced on the copper surface,which allowed the formation of a large number of active sites on the surface of the copper foil,which could reduce the nucleation potential of lithium and facilitate the uniform nucleation and deposition of lithium.Based on the half-cell,symmetrical cell and fullcell performance tested by the battery test equipment,the laser processed copper surface positively influenced the cycle life of lithium batteries at different current densities,providing a highly efficient and green feasibility method for the preparation of threedimensional copper foil collectors.