Lecture 1 (mixing)
Slurry mixing is the process of adding active materials, conductive carbon black, dispersants, binders, additives, and other components to a mixing equipment in a certain proportion and order. Under the mechanical actions such as turning, kneading, and shearing generated by the equipment, these components are mixed together to form a uniform, stable solid-liquid suspension system suitable for coating.
Goal: Achieve uniformity and consistency at both macro and micro levels
mixing
Goal: Wettability, dispersion, and stabilization are the three key indicators of good slurry
Good wettability can reduce the difficulty of dispersion and improve mixing efficiency.
Mechanical stirring dispersion refers to the process of causing strong turbulent motion of the liquid flow through intense mechanical stirring, which leads to the breakup and suspension of particle aggregations.
The spatial hindrance effect of the dispersant adsorbed on the surface of the particles generates a strong repulsive force between the particles.
The cathode and anode slurries utilize polymeric materials (PVDF/CMC) to provide steric repulsion, maintaining the stable suspension of particles.
Mixing equipment
- Universities mainly use magnetic mixing and ultrasonic dispersion. Advantages: Less material usage. Problem: Poor dispersion effect.
- Commercial mixing primarily uses planetary mixing. Advantages: excellent dispersion effects. Problem: requires a larger amount of material.
Mixing device
Mixing process
The left figure shows the general mixing process (revolution speed~20rpm)
Preparation of PVDF glue solution
Slurry dispersion
The entire mixing process controls the temperature of the slurry, and a vacuum step is performed before shipment to ensure that the slurry coating is free of bubbles.
Monitoring methods
Typically, these methods are used to monitor the slurry.
Company introduction
Welcome to Canrd Company (Canrd stands for “Creating Avenues for New Research Development”，website: www.canrd.com ). We specialized in:
- Electrochemical experiment consumables, including coin cell cases, cathodes, anodes, electrodes, electrolytes, and various other materials.
- Battery cell research and development outsourcing, offering Custom-made electrodes, dry cells, finished battery cells, and battery cell testing.
- Test line equipment, such as coin cell equipment lines, pouch cell test lines, cylindrical cell test lines, and more.
We have strong research and development capabilities.If you are interested, please feel free to contact us at any time.
Phone：19867737979
Email：contact@canrd.com
Wechat：contactcanrd
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