Solvothermal Reactors

Solvothermal reactors give you the sealed pressure-temperature window where crystalline cathode precursors, zeolites, MOFs, and nanostructured oxides actually nucleate. This collection is built for benchtop hydrothermal and solvothermal synthesis at lab and pilot scales — Teflon-lined autoclaves and stirred mini batch reactors that hold a vaporized solvent above its normal boiling point so the reaction proceeds in a single supercritical or near-supercritical liquid phase.

The vessels here fall into two practical groups, and the choice is driven by whether you need active mixing during the dwell.

• Static PTFE-lined autoclaves — a stainless outer shell with a chemically inert PTFE (or PFA) inner cup. Best for slow nucleation chemistries where stirring would disrupt crystal habit: zeolite frameworks, MOF single crystals, layered double hydroxides, hydrothermal LFP and LiCoO2 precursors.
• Stirred mini batch reactors — a forged 316 stainless or Hastelloy C-276 pressure vessel with either magnetic coupling or a sealed mechanical shaft. Use these when slurry homogeneity, gas-liquid contact, or controlled cooling ramps matter: nickel-rich hydroxide precursors, sulfide solid electrolytes, supported catalyst syntheses, and viscous or particulate-laden mixtures that a stir bar cannot move.

Within the stirred group, the stirring mode is the next decision. Magnetic stirring keeps the seal completely static and is the safer choice for volatile or toxic solvents and for long unattended runs; the tradeoff is a torque ceiling that limits viscous slurries and high solid loadings. Mechanical shaft stirring drives a true impeller through a rotary seal, so it handles higher viscosities, larger particle loads, and faster mass transfer — at the cost of a dynamic seal that needs inspection between runs.

Typical operating envelopes for the units listed here run up to roughly 300 C and 10 MPa, with working volumes from about 25 mL up to 500 mL — small enough to be economical with expensive precursors, large enough to produce gram-scale powder for downstream electrode coating and cell builds.

If you are screening new crystal phases or growing single crystals, start with the static PTFE-lined autoclaves. If you are scaling up a known recipe, controlling particle size distribution, or running a viscous precursor slurry, move to the stirred mini batch reactors. For the upstream and downstream steps in a wet-synthesis workflow, see Liquid-Phase Synthesis and the broader Synthesis Equipment collection.