Preparation process for copper foil for lithium ion battery current collector

Abstract

The invention relates to an electrochemical coating film and particularly relates to a preparation process for a copper foil for a lithium ion battery current collector. The preparation method comprises the steps of: firstly, carrying out local insulating treatment on the surface of an electro-deposition roller of an electrolytic copper foil to form a lattice point shaped pattern; then, carrying out an electro-deposition process for the electrolytic copper foil, wherein the copper foil obtained by deposition is a mesh-shaped foil sheet with the lattice point pattern consistent with that of the electrical insulating region. According to the preparation process for the copper foil for the lithium ion battery current collector, the mesh-hole-shaped copper foil for the cathode current collector of the lithium ion battery is prepared, the weight ratio of the copper foil in the cathode piece in the lithium ion battery can be reduced, the unit weight capacity of the cell is improved, and the preparation process can be compatible with the copper foil production device used in the existing lithium ion battery production; and the preparation process can be achieved only by improving the existing copper foil production device part, namely the electro-deposition roller.

Description

technical field

[0001] The invention relates to an electrochemical plating film, in particular to a preparation process of a copper foil for a lithium ion battery current collector. Background technique

[0002] Lithium (ion) battery is a secondary technology widely used at present, which has the advantages of large capacity, small size and light weight. In the existing lithium-ion batteries, copper foil is usually used as the current collector of the negative electrode, and the negative electrode material is coated on the surface of the copper foil to form a negative electrode sheet; the aluminum foil is used as the positive electrode current collector, and the positive electrode active material is coated on the surface of the aluminum foil to form a positive electrode sheet ; The positive electrode sheet and the negative electrode sheet are separated by a separator and stacked together to form a lithium-ion battery. The electric capacity per unit weight of a battery is an...