Device for coating graphene on surfaces of metal foils

Abstract

The invention discloses a device for coating graphene on surfaces of metal foils. The device comprises a control unit, and an unwinding unit, a coating printing device, a baking unit and a winding unit arranged in sequence in a moving direction of the metal foils; the metal foils are aluminum foils or copper foils; the coating printing device comprises a pressing roller, a driving silica gel roller and a driving steel roller laminated from top to bottom; the driving silica gel roller and the driving steel roller are rotated in opposite directions by keeping a micron gap; the driving steel roller is dipped in a colloid pool with viscous materials; and a substrate is arranged between the pressing roller and the driving silica gel roller. The device realizes uniform spraying of materials with submicron thicknesses and thinner layers on the surface of the substrate to meet the thickness requirements of the graphene coated on the metal foils, and achieves excellent adhesion to effectively reduce the contact resistance between carbon particles and the metal foils.

Description

technical field [0001] The invention belongs to the technical field of power batteries / supercapacitors, and in particular relates to a device for coating graphene on metal foil. Background technique [0002] Power batteries and supercapacitors are widely used in the field of new energy technology. In power batteries and supercapacitors, the pole piece of the electrode is a key component. Coating machines are usually required to coat functional materials such as carbon particles, carbon nanofibers, graphene, etc. Evenly coated on the surface of metal foil (copper foil or aluminum foil). The principle of a common coating machine is similar to a gravure printing machine. The rolled substrate is conveyed to the coating printing area through the transmission mechanism, and the functional material is coated on the designated position on the surface of the substrate, and then dried, wound, etc., used in the production of subsequent products. Among them, the thickness, uniformity,...

AI Technical Summary

Problems solved by technology

[0003] The Chinese patent "Lithium battery pole piece coating machine (201320299315.1)" discloses a lithium battery pole piece coating machine, which is composed of a pole piece unwinding device, a tension adjustment device, a slurry coating device, a drying device and a collecting machine. The existing problem is that the conventional coating machine scheme cannot realize the coating of graphene material on the metal foil, because industrial graphene has good electrical conductivity only under the condition of a very thin layer. , and the thinner the thickness is, the closer it is to single-layer graphene, the better the conductivity. Therefore, graphene-coated carbon metal foil requires a thin and uniform graphene material to be coated on the metal foil, and the graphene and the substrate must have a strong Adhesion ability, and the existing coating method for graphene, that is, mesh roll coating (micro-gravure and gravure coating), is difficult to meet this coating requirement, and cannot ensure the electrical properties of the pole piece

Images