A preparation method of ultra-thin electrolytic copper foil for lithium-ion batteries with high tensile strength

A lithium-ion battery, high tensile strength technology, applied in the field of copper foil, can solve the problems of uniform ultra-thin copper foil, difficult balance, lithium battery use needs, etc., to achieve high tensile strength, improve stability, high elongation rate effect

Active Publication Date: 2021-06-18
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, on the one hand, high tensile strength is required, so that it is not easy to break when coating the negative active material; The internal resistance improves the safety and capacity of the battery. However, the tensile strength and elongation of electrolytic copper foil are trade-offs. Especially for ultra-thin copper foil, it is more difficult to achieve a balance between the two; preparing ultra-thin copper foil At the same time, the precision requirements of the production process are very high, and it is necessary to continuously produce extremely thin copper foil with excellent quality at high current density, high electrolysis temperature, and short electrolysis time. Due to the use of various additives in the prior art, each component is in Interaction under strict electrolytic conditions makes the performance of the electrolyte unstable, and it is impossible to produce ultra-thin copper foil with uniform thickness, or the quality of copper foil under extremely thin thickness cannot meet the needs of lithium batteries

Method used

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  • A preparation method of ultra-thin electrolytic copper foil for lithium-ion batteries with high tensile strength
  • A preparation method of ultra-thin electrolytic copper foil for lithium-ion batteries with high tensile strength
  • A preparation method of ultra-thin electrolytic copper foil for lithium-ion batteries with high tensile strength

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preparation example Construction

[0029] In one embodiment, the preparation method of 4-[[2-(acetylamino)ethyl]dithio]-1-butanesulfinic acid sodium comprises: 1,1-dioxo-1,2 -Dithiane and N-acetylcysteamine were dissolved in 75mL of absolute ethanol at a molar ratio of 1:1, and the methanol solution containing 33.3mmol of sodium methoxide was added dropwise to the above ethanol solution, and stirred continuously until the solution The pH 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.

[0030] 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.

[0031] The CAS number of the 1,1-dioxo-1,2-dithiane is 18321-15-8; the CAS number of the N-acetyl cysteamine is 1190-73-...

Embodiment

[0073] 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.

[0074] A: Sulfur-containing compounds

[0075] A1: Sodium 4-[[2-(acetylamino)ethyl]dithio]-1-butanesulfinate

[0076] 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.

[0077] A2: Tetrahydr...

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Abstract

The present invention relates to the field of copper foil, and more particularly, the present invention relates to a preparation method of ultra-thin electrolytic copper foil for high tensile strength lithium ion battery. A first aspect of the present invention provides an electrolyte additive for ultra-thin electrolytic copper foil for high tensile strength lithium ion batteries, the electrolyte additive includes 0.15-0.9g / L sulfur-containing compounds, 0.07-0.4g / L Carrier, 0.01~0.27g / L nonionic surfactant, 0.07~0.4g / L chloride salt. The ultra-thin electrolytic copper foil for lithium ion battery with high tensile strength provided by the present invention has few types of electrolyte additives, which improves the stability of the electrolyte; meanwhile, the ultra-thin copper foil prepared by using the electrolyte in a specific proportion obtained by the present invention The weight per unit area is 43.0~75.0g / m 2 between, the weight per unit area is very poor <1.0g / m 2 , uniform thickness, high tensile strength and high elongation.

Description

technical field [0001] The invention relates to the field of copper foil, and more specifically, the invention relates to a preparation method of an ultra-thin electrolytic copper foil for lithium-ion batteries with high tensile strength. 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...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C25D1/04C25D3/38C25D7/06
CPCC25D1/04C25D3/38C25D7/0614Y02E60/10H01M4/661
Inventor王俊锋刘晓燕郭志航庄伟雄叶敬敏温丙台廖平元刘少华李建国叶铭叶成林庄如珍郭丽平郑衍年肖建斌
OwnerGUANGDONG FINE YUAN SCI TECH CO LTD