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Recycling and Utilization Method of Positive Electrode Slurry Residue

A cathode slurry and slurry technology, which is applied in the field of cathode slurry residual recycling, can solve the problems of slurry waste, increase of excrement volume, easy impact on the environment, etc.

Active Publication Date: 2021-05-18
合山市华美新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, this method increases the amount of excrement, and if the excrement is not properly disposed of, it will easily affect the environment; on the other hand, the residual slurry is wasted and cannot be fully utilized

Method used

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  • Recycling and Utilization Method of Positive Electrode Slurry Residue
  • Recycling and Utilization Method of Positive Electrode Slurry Residue
  • Recycling and Utilization Method of Positive Electrode Slurry Residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The process of lithium battery production includes slurry preparation and slurry use, and then there will be a certain amount of residue; positive electrode slurry residue: mixing tank, screen, slurry basin, slurry bucket, chute, baffle plate, Beaker, viscosity needle, steel roller, rag; first briefly describe the recycling method of the slurry residue on the mixing tank: after the mixing tank is discharged, scrape off the residual material on the wall of the tank and the stirring paddle with a silica gel plate, and then stir The barrel is injected into the solvent N-methylpyrrolidone (NMP) used for the positive electrode ingredients, hereinafter referred to as NMP, and the amount of NMP injected is about 80% of the volume of the mixing barrel; the mixing barrel is closed, and vacuum high-speed stirring is carried out for 1H, and the mixture in the stirring barrel is a large amount of The NMP passed through the 200-mesh sieve, and the filtered solvent NMP is used as the ...

Embodiment 2

[0046] Using the scraping device to replace the silica gel plate operation, the remaining positions of the treatment include: the inner wall of the slurry pan, the inner wall of the slurry tank, the inner wall of the retaining tank, and the outer wall of the pressure roller. The cleaning method of the mixing tank is the same as in Example 1.

[0047] Turn on the suction pump, vacuum pump and high-pressure pump in the scraper, control the scraper to stick to the above residual position and move through the operating lever, the scraper scoops up the positive electrode slurry above the residual position, and then is sucked by the suction head In the slurry collection bucket (here corresponds to the scraped material), the slurry in the slurry collection bucket can be used as the next batch of positive electrode slurry; at the same time, the high-pressure nozzle sprays the spray solution (NMP) to Spray the surface of the residual position after the slurry, and the spray liquid pour...

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Abstract

The invention discloses a method for recycling positive electrode slurry residue, which comprises: scraping out the positive electrode slurry on the residual position to obtain the scraped material; when the residual position is a stirring barrel, injecting N-methylpyrrolidone into the stirring barrel, stirring After cleaning, filter to obtain the first filtrate; when the residual position is other parts, use N-methylpyrrolidone to clean the residual position to obtain a cleaning solution, and filter the cleaning solution to obtain a second filtrate; combine the scraped material with the next batch of positive electrode slurry The materials are mixed and used, and the first filtrate and the second filtrate are used as raw materials for preparing the positive electrode slurry in the next batch. The method of the invention can effectively reduce excrement, make the positive electrode slurry fully recycled, reduce environmental pollution, and contribute to the cause of environmental protection.

Description

technical field [0001] The invention relates to the technical field of lithium battery production, and more specifically, the invention relates to a method for recycling positive electrode slurry residues used in the production process of lithium batteries. Background technique [0002] The preparation and coating of slurry is one of the key steps involved in the production process of lithium batteries, and the positive electrode slurry of lithium batteries generally includes conductive agents, solvents, binders and other substances. Mixers, coaters and roller presses are commonly used equipment for slurry preparation and coating. During the process of slurry preparation and coating, part of the slurry will remain in the mixing barrels of mixers, coaters and roller presses. , slurry tray, slurry bucket, retaining groove and pressure roller and other positions. For this part of the residual slurry, the traditional method is to directly wash the mixing tank, the slurry pan, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D37/00B01F13/10H01M10/058
CPCB01D37/00H01M10/058B01F33/80B01F33/836Y02E60/10Y02P70/50
Inventor 何敏华
Owner 合山市华美新能源科技有限公司
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