Manufacturing method of electrolytic copper foil for lithium ion secondary battery

A secondary battery and electrolytic copper foil technology, applied in the electrolysis process, electroforming, etc., can solve the problems of inability to adjust the properties of copper foil, cumbersome switching of copper foil, and differences, and achieve the effect of stable and easy-to-control brightness

Active Publication Date: 2020-04-17
甘肃德福新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for making electrolytic copper foil for lithium ion secondary batteries, so as to solve the problem that the existing method of making electrolytic copper foil cannot adjust the properties of copper foil through simple adjustment of additives. Different formula adjustments are required, which leads to the cumbersome problem of switching back and forth between copper foils required by different manufacturers in production

Method used

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  • Manufacturing method of electrolytic copper foil for lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Put the clean copper rod or copper plate into the copper-dissolving tank containing sulfuric acid, control the temperature, at about 85°C, blow air in with a screw fan, and dissolve the copper to prepare the main electrolyte.

[0033] The main electrolyte is mixed with the additive solution after multi-stage filtration to obtain the electrolyte. The copper ion concentration of the electrolyte is 82g / L, the sulfuric acid content is 103g / L, and the chloride ion concentration is 20mg / L.

[0034] The additive composition and concentration are:

[0035] Dosage 01: sodium polydithiodipropane sulfonate 10mg / L;

[0036] Two doses are used for 02: collagen (average molecular weight 3000-5000) 10mg / L and polyether ammonia 5mg / L;

[0037] 03 doses: polyethylene glycol (average molecular weight 6000) 5mg / L;

[0038] Dosage 04: Hydroxyethylcellulose (viscosity 300) 10mg / L.

[0039] The above electrolytic solution is heated to 45°C through the heat exchanger, and then poured into ...

Embodiment 2

[0041] Put the clean copper rod or copper plate into the copper-dissolving tank containing sulfuric acid, control the temperature, at about 85°C, blow air in with a screw fan, and dissolve the copper to prepare the main electrolyte.

[0042] The main electrolyte is mixed with the additive solution after multi-stage filtration to obtain an electrolyte. The electrolyte has a copper ion concentration of 90 / L, a sulfuric acid content of 100 g / L, and a chloride ion concentration of 25 mg / L.

[0043] The additive composition and concentration are:

[0044] Agent 01: sodium polydisulfide dipropane sulfonate: 14mg / L;

[0045] Dosage 02: polyethyleneimine (average molecular weight 1200): 5mg / L;

[0046] Dosage 03: polyethylene glycol (average molecular weight 6000) 7mg / L;

[0047] Dosage 04: Hydroxyethylcellulose (viscosity 400) 20mg / L.

[0048] The above electrolytic solution is heated to 55°C through a heat exchanger, and then poured into the electrolytic cell, at 50A / dm 2 Under ...

Embodiment 3

[0050] Put the clean copper rod or copper plate into the copper-dissolving tank containing sulfuric acid, control the temperature, at about 85°C, blow air in with a screw fan, and dissolve the copper to prepare the main electrolyte.

[0051] The main electrolyte is mixed with the additive solution after multi-stage filtration to obtain an electrolyte. The electrolyte has a copper ion concentration of 85g / L, an acid content of 105g / L, and a chloride ion concentration of 28mg / L.

[0052] The additive composition and concentration are:

[0053] 01 agent: N,N-Dimethyldithioformamide propane sulfonate sodium 20mg / L;

[0054] 02 doses: collagen (average molecular weight 3000-5000) 10mg / L;

[0055] Dosage 03: polyethylene glycol (average molecular weight 6000) 7mg / L;

[0056] Dosage 04: Hydroxyethylcellulose (viscosity 380): 30mg / L.

[0057] The above electrolytic solution is heat exchanged to 50 o C, into the electrolyzer, at 45A / dm 2 Under the current density, keep the tempera...

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Abstract

The invention discloses a manufacturing method of electrolytic copper foil for a lithium ion secondary battery, and belongs to the technical field of the electrolytic copper foil. The manufacturing method of the electrolytic copper foil for the lithium ion secondary battery is used for solving the problem that an existing manufacturing method of the electrolytic copper foil cannot achieve copper foil property adjustment through simple adjustment of addition agents. The manufacturing method comprises the steps that a main electrolytic solution is manufactured; an electrolytic solution is manufactured; raw foil is manufactured through electrolysis; and anti-oxidation treatment is conducted. According to the manufacturing method of the electrolytic copper foil for the lithium ion secondary battery, the ratio of the four addition agents is adjusted, and therefore the growth process of electro-deposition crystal grains can be flexibly controlled, and the purpose that the electrolytic copperfoil with different tensile strength values is manufactured can be achieved. The selection of the range of the content of the addition agents follows the principle that physical property parameters and appearance indexes are unified and controlled, and the copper foil which has the advantages that the control is easy, and the performance meets the requirement can be manufactured only within the control range of the manufacturing method. By means of the control in the way, the purpose that adjustment of the tensile strength of the electrolytic copper foil can be achieved through the control over the range of the viscosity of hydroxyethyl cellulose can be easily achieved.

Description

technical field [0001] The invention belongs to the technical field of electrolytic copper foil, and in particular relates to a method for preparing electrolytic copper foil for a lithium-ion secondary battery. Background technique [0002] In lithium-ion batteries, since the quality of the negative electrode material copper foil is second only to the positive electrode material in the entire battery, its performance directly affects the quality of the lithium battery. For example, tensile strength and elongation determine the strength and toughness of lithium battery copper foil, thereby affecting the yield and cycle life of lithium ion secondary batteries; surface roughness and thickness uniformity determine the adhesion and strength of active materials in the battery manufacturing process. The amount of coating affects the internal resistance, density, capacity and cycle life of the battery; at the same time, the surface quality of lithium battery copper foil also affects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/04C25D3/38C25D7/06
CPCC25D1/04C25D3/38C25D7/0614
Inventor 韦诗彬杨红光黄国平王乾陶梦周
Owner 甘肃德福新材料有限公司
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