The preparation of positive and negative electrode slurry for lithium batteries is a key link in battery production, which directly affects battery performance and consistency. As a high-efficiency mixing equipment, AKW Intensive Mixer has significant advantages in this field. The following is a detailed analysis from the aspects of technical characteristics, application advantages, process optimization and industry cases:

Lithium battery mixer_Battery material mixer_Lithium iron phosphate mixing granulator-AKW Mechanical Equipment Co., Ltd.

I. Technical features of AKW Intensive Mixer

High shear force and three-dimensional mixing

Through the unique rotor design and reverse stirring mode, high shear force and material movement in three-dimensional space are achieved, and the agglomerates of LiCoO₂ or graphite are effectively broken to ensure the uniform dispersion of active materials, conductive agents (such as carbon black), and binders (such as PVDF).

The vacuum environment option can reduce slurry bubbles and improve the quality of the coated pole piece.

Precise temperature control and sealing design

The jacket cooling/heating system controls the mixing temperature (such as NMP solvent needs to be at 25-30℃ to avoid volatilization) to prevent slurry viscosity fluctuations.

The fully enclosed structure avoids external pollution and is suitable for battery production environments with high cleanliness requirements.

Intelligent parameter control

The programmable logic controller (PLC) adjusts the speed (usually 200-1500rpm), mixing time, vacuum degree and other parameters to adapt to different formulas (such as lithium iron phosphate or silicon-carbon negative electrode).

AKW lithium battery slurry preparation Intensive Mixer

2. Application advantages in lithium battery slurry preparation

Improve dispersion efficiency and consistency

Traditional planetary mixing takes several hours, and the AKW mixer can complete the homogenization within 30-60 minutes, and the solid content of the slurry can be increased to more than 70%, reducing the use of solvents.

Dynamic viscosity control (such as the target viscosity of the positive electrode slurry is 5000-10000 mPa·s) ensures that there are no streaks or cracks during coating.

Adapt to high solid content and new materials

It can still effectively disperse the high-viscosity slurry of high-nickel ternary (such as NCM811) or silicon-based negative electrode to reduce sedimentation and stratification.

Supports the mixing of water-based systems (such as CMC/SBR binders) to reduce VOC emissions.

Reduce production costs

Reduce equipment footprint, and energy consumption is reduced by about 30% compared to traditional mixing.

The slurry has high stability and reduces the rework rate of the coating process.

AKW lithium battery slurry preparation Intensive Mixer

III. Key points of process optimization

Addition sequence and process parameters

Typical positive electrode slurry steps: solvent (NMP) → binder dissolution → conductive agent dispersion → active material addition → solvent replenishment and viscosity adjustment.

It is recommended to adjust the speed in stages: low-speed premixing (200rpm) → high-speed dispersion (1200rpm) → low-speed defoaming (500rpm).

Slurry rheological property control

Use a rotational viscometer for real-time monitoring to ensure that the shear thinning behavior is suitable for slit extrusion coating.

The pressure in the vacuum degassing stage is recommended to be -0.08～-0.1MPa, and maintained for 10-15 minutes.

Equipment maintenance and cleaning

Immediately after use, clean the machine with a solvent (such as deionized water or NMP) to prevent the slurry from solidifying and blocking the flow channel.

Check the rotor wear regularly to avoid contamination by metallic foreign matter (especially important for LFP materials that are sensitive to magnetic impurities).