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Composite Additives for Electrolytic Copper Foil and Its Deposition Process

A composite additive and electrolytic copper foil technology, applied in electrolytic process, electroforming, etc., can solve the problems of reducing battery power and capacity, rough surface of copper foil, low tensile performance, etc., and achieve high tensile strength and elongation, The effect of fine and smooth grain structure and excellent charge and discharge characteristics

Active Publication Date: 2018-03-23
佛冈建滔实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Copper foil is used as the negative electrode material of the automobile power battery. If the tensile performance of the copper foil is not high enough or the surface density is not uniform, it will cause cracks in the pole piece of the power battery, which will greatly reduce the power and capacity of the battery. Therefore, the tensile performance of the copper foil and The uniformity of the surface requires certain requirements
[0004] The electrolytic copper foil in the prior art is not high in tensile performance and elongation, and the pole piece cannot withstand rapid charge and discharge, and is prone to cracks; the surface of the copper foil is relatively rough, and the contact area with the negative active material is not large

Method used

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  • Composite Additives for Electrolytic Copper Foil and Its Deposition Process
  • Composite Additives for Electrolytic Copper Foil and Its Deposition Process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment discloses a composite additive for electrolytic copper foil, the composite additive consists of:

[0025] The total content of sodium polydithiodipropane sulfonate or sodium allyl sulfonate is 20ppm, quaternary ammonium salt 5ppm, gelatin 20ppm, sodium isethionate 10ppm, chlorine 15ppm, and the flow rate of the organic mixed additive is 400mL / min. According to the above-mentioned composite additives, the deposition process flow of deposited copper foil is as follows:

[0026] Take the electrolytic solution whose copper content is 70g / L, sulfuric acid content is 90g / L, chloride ion is 15ppm, and temperature is 45°C, and then add the composite additive to the electrolytic solution so that the electrolytic solution has a flow rate of 45m 3 / h, current density 5000A / m 2 Electrodeposition was carried out under the parameters.

Embodiment 2

[0027] Example 2: This example discloses a composite additive for electrolytic copper foil. The composite additive is composed of: sodium polydisulfide dipropane sulfonate or sodium allyl sulfonate with a total content of 40ppm, quaternary ammonium salt 10ppm, gelatin 50ppm, Sodium isethionate 10ppm, chlorine 20ppm, the organic mixed additive flow rate is 500mL / min.

[0028] According to the above-mentioned composite additives, the deposition process flow of deposited copper foil is as follows:

[0029] The copper content in the electrolyte is 80g / L, the sulfuric acid content is 140g / L, and the temperature is 50°C. Add organic mixed additives to the electrolyte so that the flow rate of the electrolyte is 70m 3 / h, current density 7000A / m 2 electrodeposition under conditions.

Embodiment 3

[0030] Example 3: This example discloses a composite additive for electrolytic copper foil. The composite additive is composed of: sodium polydisulfide dipropane sulfonate or sodium allyl sulfonate with a total content of 80 ppm, quaternary ammonium salt 15 ppm, gelatin 70 ppm, Sodium isethionate 30ppm, chlorine 30ppm, the organic mixed additive flow rate is 600mL / min.

[0031] According to the above-mentioned composite additives, the deposition process flow of deposited copper foil is as follows:

[0032] The copper content in the electrolyte is 90g / L, the sulfuric acid content is 130g / L, and the temperature is 60°C. Add organic mixed additives to the electrolyte so that the flow rate of the electrolyte is 80m 3 / h, current density 8500A / m 2 electrodeposition under conditions.

[0033] Please refer to Table 1, which is the physical performance table of the finished copper foils of Examples 1 to 3. It can be seen that the electrolytic copper foils for automotive power batter...

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Abstract

The invention belongs to the technical field of electrolytic copper foils and particularly relates to a composite additive for the electrolytic copper foils and a deposition process thereof. The electrolytic copper foils are manufactured by stripping copper on a cathode surface, which is separated out through an electrolytic method adopting a sulfuric acid type copper electrolyte; the sulfuric acid type copper electrolyte comprises at least one of sodium 3,3'-dithiodipropane sulfonate or sodium allysulfonate, quaternary ammonium salt, gelatin, sodium hydroxyethyl sulfonate and chlorine. The copper foils manufactured by using the additive disclosed by the invention have the advantages of high tensile strength and elongation percentage, fine and smooth grain structure, uniform surface density and large contact area with cathode active materials and are capable of obviously reducing the interior contact resistance of batteries and preventing pole pieces from cracking to ensure that the batteries have excellent charge and discharge characteristics; and therefore, the electrolytic copper foils which can be used for cathode materials of automotive power batteries have great market prospect and economic value.

Description

technical field [0001] The invention belongs to the technical field of electrolytic copper foil, and in particular relates to a composite additive for electrolytic copper foil of an automobile power battery and a deposition process thereof. Background technique [0002] After more than ten years of research and development of new energy pure electric vehicles in my country, a series of breakthroughs have been made, but there are still many problems. Among them, the endurance and power performance of electric vehicles are the focus of many problems, and the power and capacity of electric vehicle power batteries directly restrict the endurance of electric vehicles. [0003] Copper foil is used as the negative electrode material of the automobile power battery. If the tensile performance of the copper foil is not high enough or the surface density is not uniform, it will cause cracks in the pole piece of the power battery, which will greatly reduce the power and capacity of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/04C25D3/38
CPCC25D1/04C25D3/38
Inventor 林家宝
Owner 佛冈建滔实业有限公司
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