How To Make Lab Slurry Mixing More Efficient?

In the research and development of lithium batteries, the uniformity of the positive and negative electrode slurries directly determines the stability of the electrode performance and the energy density of the battery. Traditional laboratory mixing equipment often has problems such as vacuum leakage, insufficient dispersion force, and cumbersome operation, resulting in low mixing efficiency and poor data reproducibility. How to solve these pain points through technological innovation? This paper takes the ACEY-EVM-1L laboratory mixing equipment as an example to deeply analyze its core design principles and technological breakthroughs.

Vacuum Sealing System

Soft sealing technology: using multi-layer silica gel composite sealing ring, with the adaptive adjustment of cylinder pressure, it can run stably for more than 24 hours in a vacuum environment of -0.098MPa (leakage rate < 0.5mbar/min), and completely eliminate slurry bubbles. All-in-one vacuum integration: The tank lid is integrated with a vacuum gauge and a quick-connect interface, which supports an external vacuum pump (optional) to achieve a higher vacuum degree (≤10⁻³ mbar), and is suitable for mixing highly sensitive materials such as silicon carbon anode.

Power & Transmission System

Gearbox inverter motor: power 0.75kw, torque output range of 0.1-15N·m, covering 1-10,000cP viscosity slurry; Frequency conversion speed regulation (0-1400rpm stepless speed change), support forward and reverse alternating mode, to avoid slurry stratification. Double-dispersed blade design: the upper blade throws slurry at a 45° inclination angle, and the lower blade is sheared at high speed to achieve three-dimensional mixing; The blade is made of 316L stainless steel, and the surface is mirror-polished (Ra≤0.2μm) to reduce material adhesion.

Tank And Operating Unit

1L double-layer stainless steel tank: inner layer of 304 stainless steel precision polishing, outer layer of water-cooled jacket (optional), temperature control range -20°C to 80°C; The coaxiality error between the tank and the stirring shaft is ≤0.05mm, which ensures no eccentric vibration in high-speed operation. Pneumatic cover opening system: precision guide pillar support + double cylinder drive, cover opening stroke 150mm, one-handed feeding and cleaning.

Core Index Measurement

Typical Slurry Test Data

NCM811 cathode slurry (72% solids, viscosity 4500cP):

Mixing time: 40 minutes (800rpm forward and reverse alternately);

Viscosity fluctuation: ±3% (standard deviation of 3 replicates).

Silicon carbon anode slurry (solid content 55%, viscosity 12000cP):

Mixing time: 60 min (continuous cutting at 600rpm);

Particle agglomeration rate: <2% (SEM observation).

Application and adaptation of lithium battery research and development: positive and negative electrode materials (lithium iron phosphate, ternary materials, silicon-based anode); Preparation of solid electrolyte slurries (sulfide/oxide systems) and advanced materials: ceramic slurries (nano zirconia, silicon nitride); Thermally conductive adhesives/electrically conductive adhesives (carbon nanotubes, silver paste).

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