Manufacturing method of high-tensile lithium battery copper foil

A manufacturing method and a technology for tensile lithium, applied in electroforming, electrolysis process, etc., can solve the problem of unstable manufacturing process, achieve the effects of stable and easy-to-control brightness, increase density, and reduce crystal growth defects

Inactive Publication Date: 2019-12-31
JIUJIANG TELFORD ELECTRONICS MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the manufacturing process of domestic lithium battery copper foil is unstable, and there are still many technical difficulties to overcome. Therefore, it is very urgent to develop a set of stable and efficient lithium battery copper foil production technology suitable for industrial production. The above characteristics of electrolytic copper foil are based on copper foil. The manufacturing principle is determined by the corresponding additives

Method used

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  • Manufacturing method of high-tensile lithium battery copper foil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add the elemental copper metal into the copper-dissolving tank containing sulfuric acid, blow in high-temperature air with a screw fan, and dissolve the copper to prepare the main electrolyte of acidic copper sulfate. The main electrolyte is filtered in multiple stages and mixed with the additive solution to obtain the electrolyte. In the liquid, the copper ion concentration is 50 g / L, the acid content is 80 g / L, the chloride ion concentration is 30 mg / L, and the composition of other additives is:

[0023] Sodium polydisulfide dipropane sulfonate: 1 mg / L;

[0024] Mercaptobenzimidazole: 2 mg / L;

[0025] Collagen (number average molecular weight 3000-5000): 3 mg / L;

[0026] Polyethyleneimine (average molecular weight 1200): 2 mg / L

[0027] Thiourea: 5 mg / L;

[0028] The above electrolytic solution is heat-exchanged to 30 o C, into the electrolyzer. The cathode of the electrolytic cell is a seamless drum type titanium roller, and the anode is a size-limited anode. a...

Embodiment 2

[0030] Add the elemental copper metal into the copper-dissolving tank containing sulfuric acid, blow in high-temperature air with a screw fan, and dissolve the copper to prepare the main electrolyte of acidic copper sulfate. The main electrolyte is filtered in multiple stages and mixed with the additive solution to obtain the electrolyte. In the liquid, the copper ion concentration is 100 g / L, the acid content is 140 g / L, the chloride ion concentration is 100 mg / L, and the composition of other additives is:

[0031] Sodium mercaptan propane sulfonate: 20 mg / L;

[0032] Sodium 3-mercapto-1-propanesulfonate: 50 mg / L;

[0033] Collagen (number average molecular weight 3000-5000): 30 mg / L;

[0034] Polyether ammonia (average molecular weight 4000): 50 mg / L

[0035] Ethylenethiourea: 70 mg / L;

[0036] The above electrolytic solution is heat exchanged to 70 o C, into the electrolyzer. The cathode of the electrolytic cell is a seamless drum type titanium roller, and the anode is...

Embodiment 3

[0038] Add the elemental copper metal into the copper-dissolving tank containing sulfuric acid, blow in high-temperature air with a screw fan, and dissolve the copper to prepare the main electrolyte of acidic copper sulfate. The main electrolyte is filtered in multiple stages and mixed with the additive solution to obtain the electrolyte. In the liquid, the copper ion concentration is 85 g / L, the acid content is 100 g / L, the chloride ion concentration is 30 mg / L, and the composition of other additives is:

[0039] Sodium polydisulfide dipropane sulfonate: 20 mg / L;

[0040] Sodium 3-mercapto-1-propanesulfonate: 3 mg / L;

[0041] Polyether ammonia (number average molecular weight 4000): 25 mg / L;

[0042] Polyethyleneimine (average molecular weight 1200): 12 mg / L

[0043] Diethylthiourea: 15 mg / L;

[0044] The above electrolytic solution is heat exchanged to 55 o C, into the electrolyzer. The cathode of the electrolytic cell is a seamless drum type titanium roller, and the an...

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Abstract

The invention discloses a manufacturing method of a high-tensile lithium battery copper foil. Copper is dissolved so that a main electrolyte can be prepared; the main electrolyte is subjected to multi-stage filtering and then mixed with an additive solution so that an electrolyte solution can be obtained; and electrolyzing is performed under the temperature of 30-70 DEG C and the electric currentdensity of 30-85 A/dm2 so that an original foil can be made. The lithium battery copper foil manufactured by the method is good in effects of the tensile strength and the ductility, and the color andthe brightness of the copper foil are stable and can be easily controlled. The tensile strength of the copper foil is obviously improved by using a thiourea compound as a C-type additive.

Description

technical field [0001] The invention relates to the technical field of manufacturing lithium battery copper foil, in particular to a method for manufacturing high tensile lithium battery copper foil. Background technique [0002] As the functional basic material of lithium-ion batteries, electrolytic copper foil is one of the necessary materials for lithium-ion batteries. With the rapid development of power batteries, especially in the field of lithium batteries, higher requirements are placed on the energy density of lithium-ion batteries. Correspondingly, the cathode material of lithium-ion batteries, electrolytic copper foil, is developing towards ultra-thinness of 12 μm and below 8 μm. , which puts forward higher requirements on the performance and quality of lithium battery copper foil: copper foil has higher requirements for tensile strength, elongation, and consistency; the thickness is thinner to meet the high energy density requirements of lithium-ion batteries. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/04C25D3/38
CPCC25D1/04C25D3/38
Inventor 杨红光江泱
Owner JIUJIANG TELFORD ELECTRONICS MATERIAL CO LTD
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