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A preparation method of ultra-thin electrolytic copper foil for general strong lithium ion battery

A lithium-ion battery and electrolytic copper foil technology, which is applied in the field of copper foil, can solve the problems of the lack of ultra-thin electrolytic copper foil methods, etc., and achieve the effect of uniform thickness and high safety

Active Publication Date: 2021-07-16
GUANGDONG FINE YUAN SCI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When electrolytic copper foil is used as the negative electrode collector of lithium-ion batteries, in order to meet the high volume capacity requirements of lithium-ion batteries, the copper foil needs to be as thin as possible. However, in the field of ultra-thin electrolytic copper foil, especially copper foil with a thickness of less than 8 microns , there is a huge technical resistance every time the thickness is reduced by 1 micron; when coating the negative active material on the surface of the copper foil, the surface of the copper foil needs to have a suitable roughness and surface wetting tension to ensure that the negative active material can be evenly coated and The adhesion is firm and not easy to fall off. At present, the existing technology still lacks the method of preparing ultra-thin electrolytic copper foil ≤ 6 microns and meeting the conditions of lithium-ion batteries.

Method used

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  • A preparation method of ultra-thin electrolytic copper foil for general strong lithium ion battery
  • A preparation method of ultra-thin electrolytic copper foil for general strong lithium ion battery
  • A preparation method of ultra-thin electrolytic copper foil for general strong lithium ion battery

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preparation example Construction

[0030] In one embodiment, the preparation method of the sodium 4-[[2-(acetylamino)ethyl]dithio]-1-butanesulfinate comprises: adding 1,1-dioxo-1, 2-Dithiane and N-acetylcysteamine were dissolved in 75 mL of absolute ethanol at a molar ratio of 1:1, and the methanol solution containing 33.3 mmol of sodium methoxide was added dropwise to the above ethanol solution, and stirred continuously until The pH of the solution was neutral, and an excess of anhydrous ether was added until no white precipitate was produced, filtered, the precipitate was washed twice with ether, and dried to obtain the product.

[0031] Preferably, the total amount of said 1,1-dioxo-1,2-dithiane and N-acetyl cysteamine accounts for 12-18 wt% of absolute ethanol; more preferably, said 1,1- The total amount of dioxy-1,2-dithiane and N-acetyl cysteamine accounted for 15% by weight of absolute ethanol.

[0032] The CAS number of the 1,1-dioxo-1,2-dithiane is 18321-15-8; the CAS number of the N-acetyl cysteamine...

Embodiment

[0075] Hereinafter, the present invention is described in more detail through examples, but it should be understood that these examples are only illustrative and not restrictive. Unless otherwise stated, the raw materials used in the following examples are commercially available.

[0076] A: Grain refiner

[0077] A1: Sodium 4-[[2-(acetylamino)ethyl]dithio]-1-butanesulfinate

[0078] The preparation method of the 4-[[2-(acetylamino) ethyl] dithio]-1-butanesulfinic acid sodium comprises: 5g 1,1-dioxo-1, 3.92g 2-dithia Alkanes and N-acetylcysteamine were dissolved in 75mL of absolute ethanol, and the methanol solution containing 33.3mmol of sodium methoxide was added dropwise to the above ethanol solution, stirring continuously until the pH of the solution was neutral, and an excess of anhydrous ether was added to No more white precipitate was produced, filtered, the precipitate was washed twice with ether, and dried to obtain the product.

[0079] A2: Ethylenethiourea, CAS: ...

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Abstract

The invention relates to the field of copper foil, and more specifically, the invention relates to a preparation method of ultra-thin electrolytic copper foil for general strong lithium-ion batteries. The first aspect of the present invention provides an electrolyte additive for ultra-thin electrolytic copper foil for lithium-ion batteries. The electrolyte additive includes 0.2-0.7 g / L grain refiner, 0.1-0.5 g / L agent, 0.01~0.3g / L wetting agent. The ultra-thin electrolytic copper foil for lithium batteries provided by the invention has low roughness and high surface wetting tension; at the same time, the ultra-thin electrolytic copper foil for lithium batteries provided by the invention has a thickness not higher than 6 microns, uniform thickness, and surface density Very poor <1.0g / m 2 , the safety is high during the preparation process, and the copper foil will not be burnt.

Description

technical field [0001] The invention relates to the field of copper foil, and more specifically, the invention relates to a preparation method of ultra-thin electrolytic copper foil for general strong lithium-ion batteries. Background technique [0002] As the current collector of the negative electrode of lithium-ion batteries, copper foil is the core raw material for making lithium-ion batteries, accounting for about 5% of the total cost of batteries. The development of its production technology and performance directly affect the production process and performance of lithium-ion batteries. and production costs. With the rapid development of smart phones and new energy vehicles in recent years, the demand for lithium-ion batteries has skyrocketed, and higher requirements have been put forward for their performance and quality. In the early stage of lithium battery production and development, battery manufacturers all chose rolled copper foil to make battery negative elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D3/38C25D1/04
CPCC25D3/38C25D1/04Y02E60/10H01M4/661H01M10/052
Inventor 王俊锋钟孟捷叶敬敏王崇华王洪杰温丙台叶冬萌刘焕添廖平元刘少华杨剑文郑衍年温秋霞张小玲黄勇
Owner GUANGDONG FINE YUAN SCI TECH CO LTD