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Copper foil production conjoint machine and high-bonding strength copper foil technology for lithium ion battery

A conjoined machine, high bonding technology, applied in electroforming, electrolysis process, etc., can solve problems such as poor bonding force, and achieve the effect of reducing emissions, easy operation and environmental protection

Active Publication Date: 2013-06-19
FUJIAN QINGJING COPPER FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, there is no anchoring of crystal grains on the bright side of copper foil, and the adhesion will be poor

Method used

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  • Copper foil production conjoint machine and high-bonding strength copper foil technology for lithium ion battery
  • Copper foil production conjoint machine and high-bonding strength copper foil technology for lithium ion battery
  • Copper foil production conjoint machine and high-bonding strength copper foil technology for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Integrated processor for copper foil production, see Figure 4 and Figure 5 , including a raw foil machine 5 and a post-processing machine 6, the raw foil machine includes a cathode roll 5-1, an arc-shaped anode tank 5-2, the cathode roll is rotated in the anode tank, and the post-processing machine is sequentially connected to include copper foil Pretreatment tank 6-1, first washing tank 6-2, passivation tank 6-3, second washing tank 6-4 and winding device 6-5; wherein, the post-processing machine is connected after the foil machine , the straight-line distance between the copper foil input roller 7 in the pretreatment tank of the post-processing machine and the copper foil stripping roller 8 of the raw foil machine is not more than 3 meters, and the two faces of the copper foil 9 in the pretreatment tank along the direction of entering the tank are respectively set There are anode plates 10 for roughening treatment, and at the same time, anode plates 11 for curing t...

Embodiment 2

[0054] Lithium-ion battery high bond strength copper foil process, this process is based on the post-treatment process of the lithium-ion battery high bond strength copper foil produced by the copper foil in embodiment 1. The content of the post-processor in embodiment 1 should be As the content of the post-processing machine in this embodiment, the post-processing process includes feeding the copper foil with the double-sided roughness Rz less than 1.7 microns and Ra less than 0.25 microns from the peeling roller of the raw foil machine into the copper foil through the copper foil introduction roller. The post-processing machine performs double-sided roughening treatment, double-sided curing treatment, water washing, double-sided passivation treatment and water washing, wherein the double-sided roughening treatment and double-sided curing treatment are both in the pretreatment tank of the post-processing machine In the pretreatment tank, the two sides of the copper foil along ...

Embodiment 3

[0062] Since the usual anti-oxidation passivation treatment is chromium-containing anti-oxidation passivation treatment, because chromium is a carcinogen, no matter it is acidic or alkaline chromic acid solution, it cannot meet the requirements of environmental protection. Chromium-containing products are prohibited from being imported in the European Union (RoHS) and the United States. It has also been included in the zero discharge wastewater standard in China. Therefore, the present embodiment is a further optimized scheme based on embodiment 2, the solution of the passivation treatment is deionized water as the basic solvent, and its process parameters are:

[0063] Sodium stannate 6-20 g / l

[0064] Sodium hydroxide 8 g / l

[0065] Temperature 30-60℃

[0066] Current density 0.5 – 1.5 A / dm 2 ,

[0067] The electrodeposition thickness is less than 0.5 microns.

[0068] Among them, sodium stannate is a standard chemical product in the market.

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Abstract

The invention discloses a copper foil production conjoint machine and a high-bonding strength copper foil technology for a lithium ion battery. The copper foil production conjoint machine comprises a foil production machine and a post-treatment machine. The post-treatment machine is connected to the back of the foil production machine. A straight-line distance between a treatment tank copper foil input roller of the post-treatment machine and a copper foil stripping roller of the foil production machine is less than or equal to 3m. A rough treatment anode plate and a curing treatment anode plate are arranged along two surfaces of copper foil in a pre-treatment tank of the post-treatment machine. A post-treatment process comprises carrying out double-surface rough treatment, curing treatment, passivation treatment and washing treatment on copper foil which is fed by the foil production machine and has double-surface roughness vales of Rz less than 1.7 micrometers and Ra less than 0.25 micrometers. Through utilization of a copper sulphate solution as a roughing solution and a curing solution, the production flow is simplified; the control process is simple and can be operated simply; and a yield is improved. The copper sulphate solution does not contain an arsenic compound, reduces pollutant discharge, is conducive to environmental protection, and has obvious economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of copper foil production, and in particular relates to a copper foil production conjoined machine and a high-bonding-strength copper foil process for lithium-ion batteries. The surface roughness increases the contact area with the negative electrode active material and reduces the interfacial gap, thereby increasing the bonding strength, reducing internal resistance, and prolonging the cycle life of the lithium-ion battery. Background technique [0002] Generally, electrolytic copper foil has a bright side near the cathode roller and a rough side near the anode. The surface roughness of the bright side is about Ra 0.2-0.4 micron, Rz 1-1.5 micron. The surface roughness of the rough surface of copper foil with a thickness of 8 microns is about Rz 4-5 microns. The gap between the two is very large, resulting in great changes in the coating thickness and adhesion of copper foil negative active materials for lit...

Claims

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Application Information

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IPC IPC(8): C25D1/04
Inventor 郑金财杨初坤刘有坚袁智斌
Owner FUJIAN QINGJING COPPER FOIL
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