Wet Mixers

Wet mixers turn dry powders, binders, and solvents into a homogeneous, agglomerate-free slurry — and the choice of mixer architecture decides whether your coating runs streak-free or pinholes through every meter of foil. This collection groups the wet-side mixing and post-mix conditioning equipment used in lab-scale battery, fuel-cell, and electrolyzer electrode fabrication, where a few percent variation in dispersion quality shows up directly as capacity loss, rate fade, or coating defects.

The equipment here falls into three working families, each solving a different part of the slurry workflow:

• Planetary vacuum slurry mixers — dual-shaft, three-shaft, and four-shaft configurations that combine low-speed planetary "folding" with high-speed dispersion under vacuum. These are the workhorse units for PVDF/NMP cathode pastes and aqueous CMC/SBR anode pastes, where bubble entrainment and binder agglomeration must both be controlled. More shafts and a dedicated dispersing head become necessary as viscosity rises or as carbon nanotubes and other hard-to-wet conductive additives are introduced.
• Three-dimensional shaker mixers and nano sand mills — Schatz-geometry 3D shakers for gentle, force-free homogenization of pre-mixed pastes and powder blends, and high-frequency wet sand mills for pushing active-material or conductive-additive particle size into the sub-micron and nano range. Use these when planetary shear alone cannot break van der Waals agglomerates.
• Vacuum slurry filters — used immediately after mixing to strip out gels, undispersed binder lumps, and oversized particles before the slurry reaches the coater. A clean, narrow particle-size distribution at the filter outlet is what lets a doctor blade or slot die produce a uniform, defect-free wet film.

Selection comes down to slurry viscosity, batch volume, and how aggressive your dispersion needs to be. Aqueous anode slurries with CMC/SBR tolerate a single high-speed dispersing shaft; high-solid-content cathode slurries with PVDF, or any slurry loaded with carbon nanotubes, generally need a dual-disperser planetary unit and a vacuum stage to keep porosity under control.

If you are setting up a new electrode line, start with a planetary vacuum mixer sized to your target batch and pair it with a vacuum slurry filter; for nano-scale active materials, add a wet sand mill upstream. For dry pre-blending of powders before the wet step, see Dry Mixers. For the downstream coating, calendering, and cell-assembly equipment that consumes these slurries, see Wet Electrode Fabrication, and for the broader category browse Mixers & Mills.