Double-face light ultrathin electrolytic copper foil for lithium battery and preparing method of double-face light ultrathin electrolytic copper foil

A technology of electrolytic copper foil and lithium battery, which is applied in the direction of battery electrodes, electrolysis process, electrode carrier/collector, etc., can solve the problems of low roughness, high roughness of rough surface, disadvantages, etc., and achieve low warpage and uniform thickness , the effect of improving quality

Active Publication Date: 2018-12-25
ZHEJIANG YONGTAI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN102168289A discloses a method for manufacturing electrolytic copper foil. Although it also obtains electrolytic copper foil with excellent strength and low roughness, the process method is relatively complicated, and a chloride ion source is added, resulting in the formation of chloride ion in the copper foil. The content is high, which affects the stability of use
[0005] CN1788111A discloses a method for manufacturing an electrolytic copper foil with a low-roughness surface. Although it obtains an electrolytic copper foil with a low-roughness surface, the roughness of the rough surface is still relatively high, and the roughness difference between the two sides of the rough surface is relatively large. is disadvantageous in some applications
In addition, the process method is relatively complicated, and a chloride ion source is added, resulting in a high content of chloride ions in the copper foil, which affects the stability of use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of double-sided light ultra-thin electrolytic copper foil for lithium batteries, the steps include

[0052] 1) Titanium anodes and titanium cathode cylinders coated with platinum group metal elements are used in electrolytic machines;

[0053] 2) immersing both the titanium anode and the titanium cathode cylinder in a pretreatment composition containing gelatin and one or more sulfonates of organic sulfides, wherein the pretreatment composition does not contain copper ions and halide ions;

[0054] 3) activating the surface of the titanium cathode by anodic and then cathodic polarization, thereby electrolytically polarizing the titanium cathode in contact with the pretreatment composition;

[0055] 4) Prepare electrolytic copper foil on the activated surface of the titanium cathode with a copper electrolyte; wherein the copper electrolyte is composed of copper sulfate, sulfamic acid and hydrogen peroxide; ultrasonic-assisted electrodeposition is applied duri...

Embodiment 2

[0060] The difference from Example 1 is: the pretreatment composition specifically includes gelatin (molecular weight 10000) 10ppm, 2-mercapto-sodium dipropane sulfonate 0.1g / L+sodium polydisulfide dipropane sulfonate 0.1g / L, solvent is water , the temperature is 42℃, the current density of anodic polarization is 20A / dm 2 , the current density of cathodic polarization is 20A / dm 2 ; Electrolyte is copper sulfate 200g / L, sulfamic acid 120g / L, hydrogen peroxide 5ml (50wt%); temperature is 45 ℃, current density is 50A / dm 2 An electrolytic copper foil having a thickness of 12 μm was prepared.

[0061] Do the same test. The visual appearance is glossy, the roughness of the rough surface is 1.4μm, the roughness of the smooth surface is 1.2μm, the sulfur concentration in the copper foil is 72ppm, the chlorine concentration is not detected, the elongation at room temperature is 10.0%, and the tensile strength is 63kg / mm 2 . Charge and discharge tests showed that no cracks occurred ...

Embodiment 3

[0063] The difference from Example 1 is that the pretreatment composition specifically includes gelatin (molecular weight 20000) 50ppm, 2-mercapto-sodium dipropane sulfonate+polydisulfide sodium dipropane sulfonate+N,N-dimethyl dithio An equal mass ratio composition of sodium formamide propane sulfonate (the concentrations of the three components are all 0.1g / L), the solvent is water, the temperature is 40°C, and the current density of anodic polarization is 10A / dm 2 , the current density of cathodic polarization is 50A / dm 2 ; Electrolyte is copper sulfate 200g / L, sulfamic acid 120g / L, hydrogen peroxide 5ml (50wt%); temperature is 45 ℃, current density is 50A / dm 2 An electrolytic copper foil having a thickness of 12 μm was prepared.

[0064] Do the same test. The visual appearance is glossy, the roughness of the rough surface is 1.3μm, the roughness of the smooth surface is 1.0μm, the sulfur concentration in the copper foil is 60ppm, the chlorine concentration is not detecte...

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Abstract

The invention belongs to the technical field of electrolytic copper foil production, and particularly relates to double-face light ultrathin electrolytic copper foil for a lithium battery and a preparing method of the double-face light ultrathin electrolytic copper foil. The method comprises the following steps that a titanium anode coated with a platinum family metal element or oxide of the platinum family metal element and a titanium cathode barrel are provided; the titanium anode and the titanium cathode barrel are immersed in a pretreatment composition containing gelatin and one or more organic sulfide sulfonate; anode polarization and cathode polarization are used for activating the surface of a titanium cathode; and a copper electrolyte is utilized for preparing the electrolytic copper foil on the activated surface of the titanium cathode. According to the method, the more uniform and cleaner titanium anode and the more uniform and cleaner titanium cathode are provided, the pretreatment composition wraps the surface of a base body before electrolytic copper foil production, and it is ensured that high surface additive concentration is achieved at the early stage of electrolysis.

Description

technical field [0001] The invention belongs to the technical field of electrolytic copper foil production, and in particular relates to a double-sided optical ultra-thin electrolytic copper foil for lithium batteries and a preparation method thereof. Background technique [0002] Electrolytic copper foil is produced by continuous electrolysis, which is currently the most commonly used copper foil production method. Due to the simple production equipment and process, easy operation, and good product performance, electrolytic copper foil has gradually become the most common copper foil production method. At present, the production of electrolytic copper foil has entered a multi-polar situation, but high-grade electrolytic copper foil is still mainly produced by Japan and some established European and American companies. China and South Korea only need to produce low-grade electrolytic copper foil with low profit. The thickness of electrolytic copper foil develops from 35 μm ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D1/04H01M4/66H01M4/70
CPCC25D1/04H01M4/661H01M4/70Y02E60/10
Inventor 王梓臣卫禾耕何人宝
Owner ZHEJIANG YONGTAI TECH CO LTD
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