Why nickel foam is a different problem
Nickel foam is a three-dimensional, open-cell nickel structure with porosity typically above 95% — closer to a metal sponge than a foil. Instead of laying a film on a surface, the active material must be loaded into the structure; instead of densifying a coating against a solid substrate, compression must bring a fragile lattice to a target thickness and porosity without destroying it. Equipment designed for slurry-on-foil doesn't transfer; the process needs purpose-built engineering.
Pasting and impregnation — the coating step
Loading active material into a 3D porous structure is an impregnation problem: paste rheology matched to pore size, loading force sufficient to fill the depth of the structure without damaging it, single- or dual-side loading, and loading uniformity through the thickness — not just across the web. IMC has engineered coating equipment specifically for nickel foam electrode pasting, applying the same fluid delivery discipline as our slurry coating lines to a substrate that behaves like nothing else in converting.
Compression — the calendering step that makes or breaks the electrode
After pasting and drying, the foam is calendered to final thickness — and this is where nickel foam programs succeed or fail. The material must be compressed enough to hit target density and porosity, improve particle-to-strut contact, and build mechanical integrity, but not so much that the hollow nickel struts fracture and pores close off. Over-compression costs porosity and breaks the conductive lattice the electrode depends on. The process window is narrow and material-specific.
This is precisely the problem IMC calenders are built for: closed-loop gap control, uniform pressure across the full face, and force control tuned to the material rather than defaulted from foil practice. Nickel foam also work-hardens and carries anisotropy from its own production — behaviors IMC designs around based on direct production experience.
Tab-edge densification is part of the same discipline: selectively compressing the unpasted margin down to a thin, solid, weldable strip for current collection — a precision selective-compression operation IMC calendering handles by design.
Slitting and finishing
Ductile, porous nickel challenges slit edges the way soft foils do, and worse: burr formation, strut tear-out, and particle generation at the cut. The knife geometry, side-load, and particle management disciplines from IMC's electrode slitting work apply directly.
Who uses nickel foam electrodes
Nickel foam is the substrate behind a widening set of energy technologies: alkaline water electrolyzers for green hydrogen — the fastest-growing consumer of nickel foam; nickel-hydrogen long-duration storage, a chemistry with spaceflight heritage now scaling for the grid; Ni-MH and Ni-Cd battery production; nickel-zinc batteries for data-center and backup power; plus fuel cells, supercapacitors, and a large research community developing on nickel foam substrates. Most of these programs eventually need a builder for the pasting and compression equipment, and very few companies have actually done it. IMC has.
Prove the process in Birmingham
Nickel foam process windows are material-specific — foam grade, paste formulation, and target porosity all move them. IMC's lab supports foam compression and process development trials so your parameters are established on real equipment before capital is committed.