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

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Problems solved by technology

On the contrary, there is no anchoring of crystal grains on

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

Example Embodiment

[0049] Example 1:

[0050] Conjoined processors 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 machines are 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 raw 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 peeling roller 8 of the green foil machine is not more than 3 meters. There is a roughening-treated anode plate 10, and at the same time, a curing-treated anode plate 11 is respectively provided on the two surfaces of the copper foil along the outgoing direction in the ...

Example Embodiment

[0053] Example 2:

[0054] The process of high bonding strength copper foil for lithium ion batteries, this process is based on the post-processing process of high bonding strength copper foil for lithium ion batteries of the copper foil production conjoined machine in Example 1. The content of the post-processing machine in Example 1 should be As the content of the post-processing machine in this embodiment, the post-processing process includes conveying the copper foil with double-sided roughness Rz less than 1.7 microns and Ra less than 0.25 microns from the peeling roller of the green foil machine and feeding it 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 t...

Example Embodiment

[0061] Example 3:

[0062] Since the usual anti-oxidation passivation treatment is the anti-oxidation passivation treatment containing chromium, because chromium is a carcinogen, no matter it is an 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, this embodiment is a further optimized scheme on the basis of Embodiment 2, and 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] 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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