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A production method of ultra-thin electrolytic copper foil for high-performance lithium-ion batteries

A technology of lithium-ion batteries and production methods, applied in the direction of electrolysis, electroforming, etc., can solve problems such as difficult production, inclusion of organic matter, and reduction of intrinsic performance of copper foil, so as to prevent fracture, prolong service life, and high tensile strength Effect

Active Publication Date: 2019-09-10
胡旭日
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it is well known that the thinner the thickness of the electrolytic copper foil, the higher the technical content, and the more difficult it is to produce; in the prior art, in order to pursue low roughness, a large amount of additives need to be added in the method of producing thin and double-sided smooth copper foil, so A large amount of organic matter is included in the copper foil, which reduces the intrinsic performance of the copper foil

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  • A production method of ultra-thin electrolytic copper foil for high-performance lithium-ion batteries

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Embodiment 1

[0021] A method for producing ultra-thin electrolytic copper foil for high-performance lithium-ion batteries, comprising the steps of:

[0022] 1) Control the copper sulfate content of the electrolyte in the high level tank to be 340-360g / L, and the sulfuric acid content to be 125-135g / L;

[0023] 2) Continuously add collagen and SPS to the head tank, control the content of collagen in the plating solution to be 0.3g / KAh, and the content of SPS to be 0.15g / KAh, and flow into the electrolytic tank after fully stirring;

[0024] 3) Electrodeposition: adjust the temperature of the plating solution to 50°C, use a high-frequency pulse power supply at a current density of 60A / dm 2 Electrodeposit the copper ions in the plating solution between the cathode and anode plates, control the frequency of the high-frequency pulse power supply to 70Hz, and adopt a duty ratio of 0.8 to prepare an ultra-thin film with a thickness of 6 microns on the surface of the titanium cathode roller. Elec...

Embodiment 2

[0026] A method for producing ultra-thin electrolytic copper foil for high-performance lithium-ion batteries, comprising the steps of:

[0027] 1) Control the copper sulfate content of the electrolyte in the high level tank to be 310-330g / L, and the sulfuric acid content to be 120-130g / L;

[0028] 2) Continuously add collagen and SPS to the head tank, control the content of collagen in the plating solution to be 0.05g / KAh, and the content of SPS to be 0.5g / KAh, and flow into the electrolytic tank after fully stirring;

[0029] 3) Electrodeposition: adjust the temperature of the plating solution to 52°C, use a high-frequency pulse power supply at a current density of 70A / dm 2 Electrodeposit the copper ions in the plating solution between the cathode and anode plates, control the frequency of the high-frequency pulse power supply to 50Hz, and adopt a duty ratio of 0.9 to prepare an ultra-thin film with a thickness of 6 microns on the surface of the titanium cathode roller. Elec...

Embodiment 3

[0031] A method for producing ultra-thin electrolytic copper foil for high-performance lithium-ion batteries, comprising the steps of:

[0032] 1) Control the copper sulfate content of the electrolyte in the high level tank to be 360-380g / L, and the sulfuric acid content to be 130-140g / L;

[0033] 2) Continuously add collagen and SPS to the head tank, control the content of collagen in the plating solution to be 0.8g / KAh, and the content of SPS to be 0.05g / KAh, and flow into the electrolytic tank after fully stirring;

[0034] 3) Electrodeposition: adjust the temperature of the plating solution to 55°C, use a high-frequency pulse power supply to conduct electrodeposition on the copper ions in the plating solution between the cathode and anode plates at a current density of 40A / dm2, and control the high-frequency pulse power supply The frequency is 100 Hz, and the duty ratio of 0.75 is adopted to prepare an ultra-thin electrolytic copper foil with a thickness of 6 microns on th...

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Abstract

The invention relates to a production method of high-performance ultrathin electrolytic copper foil for lithium-ion batteries. The method comprises the steps as follows: 1) plating solution preparation: preparing a plating solution with the copper sulfate content being 310-380 g / l and the sulfuric acid content being 120-140 g / L; 2) additive use: continuously dropwise adding collagen and SPS to theplating solution, controlling the content of collagen in the plating solution within 0.05-0.8 g / KAh and the content of SPS within 0.05-0.5 g / KAh; 3) electro-deposition: adjusting the temperature of the plating solution to 50-55 DEG C, performing electro-deposition on copper ions in the plating solution between cathode and anode plates at the current density of 40-70 A / dm<2> with a high-frequencyimpulse power supply, controlling the frequency of the high-frequency impulse power supply within 50-100 Hz, and preparing the ultrathin electrolytic copper foil on the cathode in the duty ratio being0.75-0.9. The double-sided shining ultrathin electrolytic copper foil with high tensile strength and ductility can be obtained with the method.

Description

technical field [0001] The invention relates to a production method of electrolytic copper foil, in particular to a production method of ultra-thin electrolytic copper foil for lithium ion batteries, and belongs to the technical field of production of electrolytic copper foil. Background technique [0002] Recently, the world is rapidly promoting and developing the new energy automobile industry, and lithium-ion batteries, as an essential power source for new energy, have also developed rapidly. Electrolytic copper foil not only serves as the carrier of negative active materials in lithium-ion batteries, but also acts as a collector and transporter of negative electrode electrons. Therefore, electrolytic copper foil has a great impact on the charging and discharging, service life and safety of lithium-ion batteries. Impact. [0003] With the development of battery manufacturing technology, the thickness of electrolytic copper foil used in lithium-ion batteries is gradually ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D1/04
Inventor 胡旭日
Owner 胡旭日