20khz Ultrasonic degassing Equipment for Lithium battery separator slurry with circulation system

20khz Ultrasonic degassing Equipment for Lithium battery separator slurry with circulation system

What is the ultrasonic degassing Machine ?

Ultrasonic defoamers utilize the cavitation, shearing, and vibration effects of ultrasound to physically disrupt the foam liquid film and accelerate bubble aggregation and floating, achieving efficient defoaming and foam suppression. Compared to traditional methods such as chemical defoamers and mechanical defoaming, they offer advantages such as no residue, no impact on material properties, and adaptability to various working conditions, making them widely used in industries such as chemical, food, pharmaceutical, electronics, and lithium batteries.

In the production of lithium battery separators, air bubbles in the slurry (such as PVDF, PE/PP base film coating slurry, ceramic coating slurry, etc.) can directly lead to defects such as pinholes, missed coatings, and uneven thickness in the separator coating layer, which seriously affect the safety and cycle life of the battery. Leveraging the high-efficiency degassing characteristics of ultrasonic technology, the following are specific bubble removal solutions, technical details, and key points for process optimization for high-viscosity, solid-liquid mixed systems (such as ceramic powder + binder + solvent) in lithium-ion battery separator slurries:

I. Causes of Bubble Generation in Lithium-ion Battery Separator Slurries

Identifying the sources of bubbles is crucial for targeted degassing:

Raw material mixing stage: Air is entrained during stirring when binders (such as PVDF) dissolve in solvents (such as NMP); when ceramic powders (such as Al₂O₃, SiO₂) are dispersed, residual air in the interparticle gaps or solvent evaporation generates bubbles;

Slurry transfer and storage: Air is entrained by turbulence during pipeline transportation and pumping, or tiny bubbles are formed by solvent evaporation during storage;

System characteristics leading to: High slurry viscosity (typically 1000-10000 mPa・s), resulting in low bubble buoyancy, making it difficult for bubbles to float naturally and causing them to remain stably within the slurry.

V. Typical Application Areas

1. Electronics and Semiconductor Industry

Defoaming of photoresists, developers, and etchants: Removes microfoams (particle size ≤ 5μm) to avoid photolithographic pattern defects and uneven etching;
Lithium battery production: Defoaming of positive/negative electrode slurries and separator coating slurries (e.g., PVDF+NMP systems, ceramic slurries) to prevent pinholes and missed areas in the coating layer.

2. Chemical and New Materials Industry

Defoaming of resins, coatings, and inks: Prevents pinholes and bubbles on the surface after curing, improving product smoothness;

Defoaming of adhesives and sealants: Ensures bond strength and sealing performance, suitable for automotive and construction adhesives;

Nanomaterial dispersion: Defoaming of materials such as carbon nanotubes and titanium dioxide slurries to prevent bubbles from affecting dispersion uniformity during the dispersion process.

3. Pharmaceutical and Biotechnology Industry

Injectable solutions and vaccines: Defoaming removes foam generated during production, preventing inaccurate metering or contamination during filling.
Biological reagents and cell culture media: Eliminates chemical residues, preventing foam from affecting cell growth and detection accuracy.
Traditional Chinese medicine extracts: Eliminates material loss due to foam overflow during extraction; ultrasonic defoaming improves extraction efficiency.

4. Food and Beverage Industry

Fruit juices and beverages: Defoaming prevents foam overflow during filling, ensuring accurate metering and extending shelf life.

Dairy products and sauces: Such as yogurt and ketchup production, preventing foam from affecting product texture during processing.

Alcoholic beverage production: Defoaming during the fermentation of spirits and beer to prevent excessive pressure in fermentation tanks.

5. Other Fields

Electroplating solutions: Defoaming prevents pinholes and pitting in plating, improving the surface quality of electroplated parts.

Wastewater treatment: Defoaming industrial wastewater and municipal sewage reduces the impact of foam on treatment equipment (such as aeration tanks).

Coatings and coatings: Defoaming the slurry before spraying prevents bubbles and sagging on the coating surface.

Parameter:

Application
Pharmaceutical industry: In the production of vitamin drugs, ultrasonic extraction can be used to extract vitamins from natural raw materials as active ingredients of drugs, such as extracting B vitamins from yeast and extracting vitamin E from plant oils and fats.
Health care products industry: Used to produce vitamin health products, extract vitamins from natural plants or animal tissues, and make various vitamin tablets, capsules, oral liquids and other products to meet people's demand for vitamin supplements.
Food additives: Extracted vitamins can be used as food additives to fortify foods, such as adding vitamins to beverages, dairy products, cereal products, etc. to improve the nutritional value of food.