Ultrafast laser three-dimensional micro-nanometer texturing method for surfaces of copper foil current collectors on negative poles of lithium ion batteries

Abstract

The invention belongs to the field of laser processing, and relates to an ultrafast laser three-dimensional micro-nanometer texturing method for the surfaces of copper foil current collectors on negative poles of lithium ion batteries. Ultrafast laser is adopted for three-dimensional micro-nanometer texturing of the surfaces of the copper foil current collectors; the screening process comprises the following steps: glaze copper foil current collectors and characteristic-different three-dimensional micro-nanometer textured copper foil current collectors are assembled with batteries; the performances of the batteries are tested to build a relation between the different three-dimensional micro-nanometer texturing characteristics and the performances of the batteries; and the three-dimensionalmicro-nanometer texturing characteristics for improving the performances of the batteries are screened, and are textured on the surfaces of the copper foil current collectors. The method is used formicro-nanometer texturing of the copper foil current collectors by the ultrafast laser to form functional surface microstructures on the surfaces of the current collectors; the characteristics and thefunctions thereof are improved; the copper foil current collectors and electrode materials are tightly engaged, so that the interface internal resistance and the volume change degree of the electrodematerials are reduced, the specific surface area of the current collectors and the adhesion quantity of the electrode materials are improved, the corrosion of the current collectors by electrolyte isreduced, and the performances of the batteries are improved; and the method is scientific and reasonable, and is accurate and reliable in result.

Description

technical field [0001] The invention belongs to the technical field of laser processing, and in particular relates to an ultrafast laser three-dimensional micro-nano texturing method on the surface of a negative electrode copper foil collector of a lithium ion battery. Background technique [0002] Traditional energy sources such as coal and oil have caused huge damage to the environment while promoting the rapid increase in productivity. my country's long-term coal-based energy structure and single energy consumption model have brought serious environmental pollution. In recent years, the concept of sustainable development that "lucid waters and lush mountains are golden mountains and silver mountains" has been deeply rooted in the hearts of the people. Human beings urgently need to adjust the energy structure and explore various green and environmentally friendly alternative energy sources. Lithium-ion battery is a green high-energy rechargeable chemical power source with ...

AI Technical Summary

Problems solved by technology

[0002] Traditional energy sources such as coal and oil have caused huge damage to the environment while promoting the rapid increase in productivity. my country's long-term coal-based energy structure and single energy consumption model have brought serious environmental pollution

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