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Preparation process for copper foil for lithium ion battery current collector

A lithium ion battery and a preparation process technology are applied in the field of preparation technology of copper foil for lithium ion battery current collector, and can solve the problems of high cost, thick copper wire diameter, reduction and the like

Inactive Publication Date: 2013-02-13
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, in the production of lithium batteries, copper mesh is partially used as the negative electrode current collector, which is similar to the aforementioned reduction of the weight ratio of the copper current collector in the negative electrode sheet. One problem with copper mesh is that the metal copper that needs to be drawn during production , and then weave the copper wire into a mesh cloth, the cost is high, and the diameter of the copper wire used in the mesh cloth is relatively thick, which reduces its effect of increasing the capacity of the battery unit weight to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Form electrical insulation dot pattern on electrodeposited surface by laser cladding coating method:

[0025] The process of the laser cladding coating method is as follows: on the laser cladding coating processing equipment, firstly, a layer of electrically insulating alumina powder is adsorbed on the surface of the electrodeposition roller by means of electrostatic adsorption; The surface area, that is, the dots in the circular lattice, focuses the laser beam on the electrically insulating powder layer adsorbed on the surface of the electrodeposition roller, and uses the high temperature of the laser beam to melt the electrically insulating compound powder to form and electrodeposit Film layer firmly attached to the surface of the roller;

[0026] The required mesh copper foil is prepared according to the normal electrolytic copper foil production process by using the electrodeposition roller treated with insulating patterns.

Embodiment 2

[0028] Plasma sputtering coating method:

[0029] Electrodeposition roller surface cleaning: use 2% NaOH solution to clean the electrodeposition roller surface, remove the surface oil and other pollutants, then rinse with deionized water repeatedly for 15 minutes;

[0030] Coating of photosensitive glue: Under yellow light or dark environment, evenly coat photosensitive glue on the surface of the electrodeposition roller, the thickness of the film is 30 microns, and then dry at 85 degrees Celsius for 10 minutes;

[0031] Graphics preparation: use laser graphic scanning equipment to scan the surface of the electrodeposition roller to form a dot pattern in the electrical insulation area. In this example, an array composed of multiple identical rectangles is used. After completion, the electrodeposition roller is immersed in a NaOH solution with a mass fraction of 0.5%. After 3 minutes, a pattern of electrically insulating regions was obtained. The electrodeposition roller was t...

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/66C23C14/34C23C14/04
CPCY02E60/12Y02E60/10
Inventor 唐李晟
Owner IRICO
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