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Method for treating coating waste liquid of lithium ion battery diaphragm

A lithium-ion battery and waste liquid treatment technology, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve problems such as inability to use directly, easily pollute the environment, and low concentration of waste water, and achieve Effects of extended service life, high concentration, and improved purity

Active Publication Date: 2022-05-20
深圳市德尼环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the oil-coated lithium battery separator, it usually needs to be washed with water. After washing, a certain amount of organic solvent wastewater will be produced, with a concentration of about 10% to 30%. This type of wastewater has a low concentration and cannot be used directly, making it difficult to treat
Usually, it is handed over to the solvent recovery factory for high-temperature distillation and concentration treatment, but this treatment method has waste gas emissions, which is easy to pollute the environment

Method used

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  • Method for treating coating waste liquid of lithium ion battery diaphragm
  • Method for treating coating waste liquid of lithium ion battery diaphragm
  • Method for treating coating waste liquid of lithium ion battery diaphragm

Examples

Experimental program
Comparison scheme
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preparation example 1

[0049] Preparation method of nanosulfonated polystyrene microspheres, comprising the following steps:

[0050] (1) 12kg styrene monomer, 2kg of sodium lauryl sulfate, 3kg of sodium bicarbonate and 2kg of azo diisobutyronitrile were added to the water, heated to 65 °C, the reaction was 18h, and the solid product was washed and dried to obtain nano polystyrene microspheres;

[0051] (2) The nano polystyrene microspheres obtained in step (1) were added to the concentrated sulfuric acid, and the sulfonation reaction at 55 °C was 2h, and the reaction product was washed and dried to give the nano-sulfonated polystyrene microspheres.

preparation example 2

[0053] Preparation method of nanosulfonated polystyrene microspheres, comprising the following steps:

[0054](1) 12kg styrene monomer, 2kg sodium lauryl sulfate, 3kg sodium bicarbonate and 2kg azo diisobutyronitrile were added to water, heated to 75 °C, the reaction was 10h, and the solid product was washed and dried to give nano polystyrene microspheres;

[0055] (2) The nano polystyrene microspheres obtained in step (1) were added to the concentrated sulfuric acid, and the sulfonation reaction was 8h at 30 °C, and the reaction product was washed and dried to give the nano-sulfonated polystyrene microspheres.

preparation example 3

[0057] The difference from the preparation example 1 is that the emulsifier uses polyoxyethylene stearate.

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PUM

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Abstract

The invention relates to the field of waste liquid treatment, and particularly discloses a lithium ion battery diaphragm coating waste liquid treatment method which comprises the following steps: S1, filtering to obtain a mixed organic liquid; s2, low-temperature vacuum evaporation; s3, storing the organic solvent; s4, condensation: condensing the evaporated water vapor through a vacuum condensation tank, and conveying the evaporated water vapor into a condensate water storage tank; and S5, water circulation: condensed water vapor is sent back to a water washing tank of the diaphragm coating machine through a water pump and used for diaphragm water washing, and therefore water circulation utilization is achieved. The treatment device has the advantages that waste gas is not prone to being generated during treatment of the lithium ion battery diaphragm coating waste liquid, and the environment is better protected.

Description

Technical field [0001] The present application relates to the field of waste liquid treatment, more specifically, it relates to a lithium-ion battery separator coated waste liquid treatment method. Background [0002] As an important part of lithium-ion batteries, lithium battery separators play a role in separating the positive and negative electrodes, preventing short circuits inside the battery, allowing electrolyte ions to pass freely, and completing the electrochemical charge and discharge process. Its performance determines the battery's interface structure, internal resistance, etc., directly affecting the battery's capacity, cycle performance and safety performance and other characteristics, excellent performance of the separator to improve the comprehensive performance of the battery has an important role, known as the "third electrode" of the battery by the industry. [0003] For oil-coated lithium battery separators, it is usually necessary to wash with water, and a ce...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/44C02F1/04B01D71/56B01D67/00C02F101/34C02F101/38
CPCC02F1/44C02F1/046B01D71/56B01D67/0002C02F2101/34C02F2101/38Y02E60/10
Inventor 齐峻岭余杰华李建辉林嘉荣林新芳黄永康
Owner 深圳市德尼环境技术有限公司