RWTH Aachen's Production Engineering of E-Mobility Components chair (PEM) is pushing multilayer battery electrode manufacturing from laboratory demonstration toward pilot-scale production under the ProMeBa research project.

The lab-to-pilot transfer is the program's central milestone. Researchers at the Aachen, Germany-based institute want to prove that stacked-electrode designs, which pack multiple active layers into a single cell, can be made with the throughput, quality control, and repeatability an automotive cell plant demands.

The project name ProMeBa refers to the production-oriented process chain. Conventional coating lays down a single active layer per pass. Multilayer designs let cell engineers stack a high-energy cathode with a high-power-facing layer, or grade composition through electrode thickness. That opens tuning room for energy density, fast-charge acceptance, and cycle life, but only if coating, drying, and calendering stay uniform across layers at production speeds.

PEM researchers say the technical barriers sit mostly in the wet-processing stages. Slurry rheology, drying gradients, and adhesion between layers all become harder to control when more than one coating pass stacks before solvent removal. Transferring the process to a pilot line exposes those issues under conditions a gigawatt-hour plant would recognize, rather than at benchtop scale.

What is ProMeBa trying to prove?

The project's framing focuses on scalability rather than cell chemistry. The team treats the multilayer coating process as a manufacturing platform that could later host different active materials. That positions the work closer to equipment and process-supply questions than to a specific vehicle program.

The technical objective, as the Aachen team frames it, is to demonstrate that the multilayer approach clears the uniformity and throughput bar set by single-layer coaters already running in European gigafactories. Failure to clear that bar would consign the work to research status. Crossing it would let an equipment maker adapt existing slot-die or comma-bar lines rather than build new machinery.

Who is doing the work?

PEM, based at RWTH Aachen, runs one of Europe's more active battery-manufacturing research groups. Its pilot halls host electrode coating and cell-assembly lines that suppliers and OEMs use to de-risk processes before committing production tooling. ProMeBa fits that pattern: an in-house process push that needs an industrial adopter to translate into a production line.

The published source does not name industrial partners, project budget, or a pilot-line commissioning date. Those details will determine whether the work matures into a cell plant process or remains a research demonstration.

What signals will show whether ProMeBa is maturing?

Auto-plant readers should track three downstream signals:

• Whether pilot-coated multilayer electrodes demonstrate thickness and porosity uniformity within the tolerance window existing cell makers accept for single-layer coatings.
• Whether PEM publishes line-speed, defect-rate, or cost data from the pilot run. Process-economics gaps have killed earlier attempts to commercialize stacked electrodes, and the numbers will show whether the cost case closes.
• Whether an equipment maker or cell producer signs on as an industrial partner. Pilot projects of this type typically require a converter or coater supplier, and the partner choice will indicate whether the work tilts toward European gigafactories or Asian cell makers.