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Pole piece treatment method for improving battery performance

A technology of battery performance and treatment method, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as battery energy density loss, and achieve the effect of reducing defects, improving powder removal, and avoiding rolling powder.

Pending Publication Date: 2021-11-23
BATTERO TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a pole piece treatment method to improve battery performance, which can solve the problem of slurry adhesion and the problem of loss of battery energy density due to foil thickness

Method used

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  • Pole piece treatment method for improving battery performance
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  • Pole piece treatment method for improving battery performance

Examples

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Effect test

Embodiment 1

[0034] A pole piece processing method to improve battery performance, laser thinning the smooth surface of the 6-10μm thick foil to be coated, the obtained foil structure is as follows Figure 1~2 As shown, it includes a coating film area 1 located in the middle of the foil material and foil blank areas 2 symmetrically arranged on the left and right sides of the coating film area 1 . The thinning thickness of the laser facing surface is 1 / 3 of the thickness of the foil material, that is, the thickness of the coating film area 1 is 2 / 3 of the blank area 2 of the foil material. After the foil is thinned by laser, it is plasma cleaned, and then the foil is coated with slurry according to the process requirements, such as Figure 3-4 As shown, the slurry is coated on the coating area 1 to obtain the slurry coating layer 3. After coating, the pole piece is sequentially cured, solvent volatilized, dried, stabilized and rolled. Among them, during the curing process, the pole piece i...

Embodiment 2

[0038] A pole piece processing method to improve battery performance. Laser thinning is performed on both the smooth and rough sides of the foil to be coated. The thinning thickness of the smooth side by the laser is 1 / 3 of the foil thickness, and The thinning thickness is 5 / 8 of the thinning thickness of the smooth surface. All the other methods are the same as in Example 1. Use laser thickness measurement or β-ray to measure its thickness.

Embodiment 3

[0040] A pole piece processing method for improving battery performance, which involves laser thinning the smooth surface of the foil to be coated, and the thinning thickness of the smooth surface by the laser is 20% of the foil thickness, and the rest of the method is the same as in Example 1.

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Abstract

The invention relates to a pole piece treatment method for improving battery performance, which is characterized in that a foil material to be coated is subjected to laser thinning so as to enable the foil material to be divided into a film coating area (1) and foil material blank areas (2) arranged on two sides of the film coating area (1), and the thickness of the film coating area (1) is less than that of the foil material blank areas (2). Compared with the prior art, the method can solve the problem of paste adhesion, improve the phenomena of powder falling, decarburization, foil leakage, layering and the like, can solve the problem of battery energy density loss caused by foil thickness, and can also solve a series of adverse effects caused by internal stress caused by coating thickness difference.

Description

technical field [0001] The invention relates to the technical field of battery preparation, in particular to a pole piece processing method for improving battery performance. Background technique [0002] Lithium batteries are a type of batteries that use lithium metal or lithium alloys as positive / negative electrode materials and use non-aqueous electrolyte solutions. At present, the lithium battery industry is developing rapidly, and technology, equipment, and processes have also made breakthroughs by leaps and bounds. Lithium battery pole pieces are an important part of lithium batteries and the core of lithium batteries. In the production and manufacturing process of lithium battery pole pieces, pole piece coating is a very critical process. The quality of coating not only affects the subsequent processes The production of batteries also affects the performance and safety of batteries. [0003] There are problems in the coating method of the prior art as follows: [0...

Claims

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Application Information

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IPC IPC(8): H01M4/139H01M10/052B23K26/36
CPCH01M4/139H01M10/052B23K26/36Y02E60/10
Inventor 张卫龙
Owner BATTERO TECH CORP LTD