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Copper foil for lithium battery and preparation method thereof

A lithium battery and copper foil technology, which is applied in metal material coating process, vacuum evaporation plating, coating, etc., can solve problems such as adverse reactions and processing performance, and achieve improved mechanical processing performance, small thickness difference, and improved drawing Fracture effect

Inactive Publication Date: 2021-11-16
深圳市诚威新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the high pressure of the pure copper "load" of the negative electrode current collector, researchers have made unremitting efforts. Although the thickness of the copper foil used for the negative electrode current collector of lithium batteries has dropped to 7-15 μm, due to the good ductility and mechanical processing properties of copper, However, it is difficult to process copper to 7-15 μm, and it also brings a series of adverse reactions, especially the processing performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of copper foil for lithium batteries, comprising the steps of:

[0024] (1) Take copper foil for battery, 2000#Al 2 o 3 Polish the surface of the copper foil with polishing powder for about 10 minutes, first wash it with acetone for 10 minutes to remove organic matter, then wash it with a hydrochloric acid solution with a pH of about 3 for 3 minutes, then wash it with deionized water, dry the copper foil under nitrogen protection, and use it as Copper-based material S1 spare;

[0025] (2) Wash the metal tin with acetone for 10 minutes to wash away the organic matter, wash it with a hydrochloric acid solution with a pH of about 3 for 1 minute, and then wash it with deionized water. Dry the metal tin under the protection of nitrogen and use it as a sputtering raw material for later use;

[0026] (3) Under nitrogen protection, use plasma sputtering equipment to spray the metal tin material obtained in step (2) onto the surface of S1, and control the ...

Embodiment 2

[0036] A preparation method of copper foil for lithium batteries, comprising the steps of:

[0037] (1) Take copper foil for battery, 3000#Al 2 o 3 Polish the surface of the copper foil with polishing powder for about 5 minutes, first wash it with acetone for 10 minutes to remove organic matter, then wash it with an acetic acid solution with a pH of about 0.5 for 1 minute, then wash it with deionized water, dry the copper foil under nitrogen protection, and use it as Copper-based material S1 spare;

[0038] (2) Wash the gallium metal with acetone for 10 minutes to remove the organic matter, wash it with an acetic acid solution with a pH of about 0.5 for 1 minute, then wash it with deionized water, dry the gallium metal under nitrogen protection, and use it as a sputtering raw material for later use;

[0039] (3) Under nitrogen protection, use plasma sputtering equipment to spray the metal gallium material obtained in step (2) onto the surface of S1, and control the sputterin...

Embodiment 3

[0049] A preparation method of copper foil for lithium batteries, comprising the steps of:

[0050] (1) Take copper foil for battery, 3000#Al 2 o 3 Polish the surface of the copper foil with polishing powder for about 5 minutes, first wash it with acetone for 10 minutes to remove organic matter, then wash it with a nitric acid solution with a pH of about 2 for 1 minute, then wash it with deionized water, dry the copper foil under nitrogen protection, and use it as Copper-based material S1 spare;

[0051] (2) Wash the metallic silver with acetone for 10 minutes to remove the organic matter, wash it with a nitric acid solution with a pH of about 2 for 1 minute, then wash it with deionized water, and dry the metallic silver under the protection of nitrogen as a sputtering raw material for later use;

[0052] (3) Under nitrogen protection, use plasma sputtering equipment to spray the metallic silver material obtained in step (2) onto the surface of S1, and control the sputtering...

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Abstract

The invention discloses a copper foil for a lithium battery and a preparation method thereof. The copper foil for a lithium battery is based on copper, and a 1-50nm Me metal layer (Me metal layer) is plated on the surface of the copper foil by plasma sputtering. One or more of tin, gallium, silver, gold, bismuth, etc.), and then diffuse the surface layer Me into the copper base through high temperature and high pressure grain boundary diffusion, forming a thickness of 1~5μm to form a copper- Me alloy, and then annealing the alloy layer to relieve stress to obtain a lithium battery copper foil with good processability. The alloyed copper foil of the invention significantly improves the bending resistance and other mechanical processing properties of the copper foil without affecting the electrical conductivity and corrosion resistance of the copper foil, and can be widely used in the fields of lithium ion battery negative electrode current collectors and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium battery materials, and in particular relates to a copper foil for lithium batteries and a preparation method thereof. Background technique [0002] Because copper has excellent processing ductility and electrical conductivity, it is widely used in electrical conduction-related fields such as wires and batteries. In the field of power batteries and other lithium-ion batteries, copper is also used as the negative electrode collector. However, due to the current policy orientation towards long-range electric vehicles and the increasing demand for battery energy density, it is necessary to "reduce weight" for various materials and components of batteries. "Become an important development direction of power batteries, and copper foil, as the negative electrode collector, is inevitably added to the ranks of "weight reduction". In order to solve the high pressure of the pure copper "load"...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/34C23C14/16C23C14/58C23C14/02
CPCC23C14/021C23C14/165C23C14/34C23C14/5806
Inventor 祝珍珍
Owner 深圳市诚威新材料有限公司
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