Oxidation prevention process used for lithium ion battery copper foil

A lithium-ion battery and anti-oxidation technology, which is applied in the coating process of metal materials, etc., can solve the problems of difficult control, many transition rolls, and poor wettability of copper foil surface, so as to reduce production water and save production costs.

Inactive Publication Date: 2015-11-11
ANHUI TONGGUAN COPPER FOIL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] ①The existing copper foil production process adopts the method of electroplating Cr-Zn anti-oxidation solution, the passivation film is thick and uneven, the conductivity of the copper foil is poor, the surface wettability of the copper foil is poor, the electroplating process equipment is various, the cost is high, and the transition There are many rollers, and the finished copper foil is prone to wrinkles and coils, high energy consumption, and difficult to control
[0008] ③In the traditional anti-oxidation process, the copper foil needs to be washed with water after anti-oxidation treatment, and the heavy metal-containing wastewater produced will cause serious pressure on environmental protection treatment

Method used

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  • Oxidation prevention process used for lithium ion battery copper foil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] refer to figure 1 , through the lithium battery foil integrated machine, the lithium battery foil semi-finished copper foil produced according to the patent (patent number: CN201110230192.1) process formula of "Preparation of Double-sided Photoelectrolytic Copper Foil for Special Lithium Batteries" is pulled through the anti-oxidation tank and prepared The anti-oxidation passivation solution is used to chemically coat the anti-oxidation layer, and then it is squeezed dry and directly enters the oven for drying and winding.

[0027] In anti-oxidation solution, benzotriazole 150g / m 3 , chromic anhydride 200g / m 3 , cerium phosphate 1.0g / m 3 , Vinyltriethoxysilane 1.0g / m 3 , ethanol 20L / m 3 , the temperature is 40°C, and the pH value is adjusted to 6.5 with sodium hydroxide.

[0028] This anti-oxidation solution is introduced into the anti-oxidation tank in the lithium battery foil integrated machine equipment, and will be produced according to the patent (patent numbe...

Embodiment 2

[0031] Carry out anti-oxidation treatment of copper foil with reference to the preparation method of Example 1, the anti-oxidation solution of each unit is made up of the raw material with following ratio: benzotriazole 150g / m 3 , chromic anhydride 500g / m 3 , lanthanum phosphate 1.5g / m 3 , phenyltriethoxysilane 1.0g / m 3 , ethanol 20L / m 3 , the temperature is 40°C, and the pH value is adjusted to 6.5 with sodium hydroxide.

[0032] The rough surface of the lithium battery copper foil prepared in this example is mirror-like like the smooth surface, and the surface is smooth and wrinkle-free. After testing, the wettability of the lithium battery copper foil is ≥40×10 -3 N / m (characterized by surface tension parameters), mass resistivity 0.160Ω·g / m 2 , The anti-oxidation film is uniform, does not change color and does not have any oxidation points under the condition of 140°C, 15min oven, and the copper foil slightly changes color under the condition of 160°C, 10min oven.

[00...

Embodiment 3

[0035] Carry out anti-oxidation treatment of copper foil with reference to the preparation method of Example 1, the anti-oxidation solution of each unit is made up of the raw material with following ratio: benzotriazole 150g / m 3 , chromic anhydride 500g / m 3 , yttrium phosphate 1.2g / m 3 , γ-glycidyl propyl-trimethoxysilane 1.0g / m 3 , ethanol 20L / m 3 , the temperature is 40°C, and the pH value is adjusted to 6.5 with sodium hydroxide.

[0036] The rough surface of the lithium battery copper foil prepared in this example is mirror-like like the smooth surface, and the surface is smooth and wrinkle-free. After testing, the wettability of the lithium battery copper foil is ≥40×10-3N / m (characterized by surface tension parameters) , the mass resistivity is 0.162Ω·g / m 2 , The anti-oxidation film is uniform, does not change color and does not have any oxidation points under the condition of 140°C, 15min oven, and the copper foil slightly changes color under the condition of 160°C,...

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Abstract

The invention provides an oxidation prevention process used for lithium ion battery copper foil. The method comprises the steps that a semi-finished copper foil product which is not oxidized is introduced into an anti-oxidation passivation solution to be soaked, then squeezed dry through a squeeze roll, dried through hot air of an oven and directly wound, and a copper foil product is obtained after the oxidation prevention process. The anti-oxidation passivation solution comprises, 100-200 g/m<3> of benzotriazole, 0-1000 g/m<3> of chromic anhydride, 0.1-2 g/m<3> of rare earth metals of phosphoric acid, 0.1-2 g/m<3> of organic silane coupling agents, 10-30 L/m<3> of ethyl alcohol, and the balance water. The pH value is adjusted to be 5.5-8.5 through alkali such as sodium hydroxide and potassium hydroxide. The process is free of pollution to the environment; an anti-oxidation film of the produced copper foil product is moderate, even and consistent in thickness; the copper foil product is high in electrical conductivity and wettability, and the properties of the capacitance, the number of times of charge and discharge and the service life of a lithium ion battery can be effectively improved.

Description

technical field [0001] The invention relates to an anti-oxidation process for copper foil of a lithium ion battery, in particular to an electroless plating passivation method for double-sided light copper foil for a novel lithium ion battery. Background technique [0002] In recent years, the advances in anti-oxidation technology of electronic copper foil surface for lithium-ion batteries have made the traditional anti-oxidation process of copper foil surface no longer suitable for the requirements of manufacturing green lithium-ion batteries. [0003] Lithium-ion secondary battery is a green and clean energy that is vigorously developed and advocated in the world. With the development of power supply technology, the production and use of lithium-ion secondary battery is increasing day by day. Double-sided light ultra-thin electrolytic copper foil is the key material for the negative electrode of high-quality lithium-ion secondary batteries. It affects the manufacturing pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/07
Inventor 丁士启陆冰沪王同李大双张国宝李广胜韩永强
Owner ANHUI TONGGUAN COPPER FOIL
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