Composite current collector with electrical interconnection and through-hole structure, preparation method thereof, battery pole pieces and lithium ion battery

Abstract

The invention relates to a composite current collector with electrical interconnection and a through-hole structure, a preparation method thereof, battery pole pieces and a lithium ion battery, and belongs to the technical field of lithium ion batteries. The preparation method of the composite current collector includes the following steps: (1) coloring, casting and forming to prepare a polymer base layer; (2) carrying out first vacuum metal plating on the surface of the polymer base layer; (3) making holes in the surface of the metal-coated polymer layer; and (4) carrying out second vacuum metal plating on the surface of the polymer layer. The prepared current collector is of an inner and outer double-layer structure with the through-hole structure. The inner layer is a polymer layer withthe through-hole structure, and the surface layers are metal coatings. The metal coatings cover the surface of the through holes, the through holes communicate the metal coatings. The preparation method is simple and easy in large-scale production, and can customize the thickness and hole structure distribution according to specific application indicator. Compared with a conventional foil material, the composite current collector with the electrical interconnection and the through-hole structure has the advantages of light weight, bending resistance, low cost and the like, and has a significant effect on the energy density improvement of the battery.

Description

technical field

[0001] The invention belongs to the technical field of lithium ion batteries. In particular, it relates to a composite current collector with electrical interconnection and through-hole structure, a preparation method thereof, and an application in lithium-ion batteries. Background technique

[0002] Due to the advantages of high efficiency, cleanliness, and recyclability, lithium-ion batteries are considered to be an important energy storage device to comprehensively alleviate energy crisis and environmental pollution. In recent years, with the rapid development of the electric vehicle industry, lithium-ion batteries, one of its core components, have received extensive attention and in-depth research from all walks of life. However, the current mileage and cost of electric vehicles cannot effectively compete with traditional fuel vehicles, which has greatly hindered the rapid promotion of electric vehicles. The improvement of energy density and cost reduct...

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