As battery research tends toward developing thicker electrodes for higher energy density, the challenge becomes clear: how to achieve this thickness without sacrificing quality. For thin layers, the wet thickness typically reaches up to 150 µm, but thick layers can extend to 600 µm. Coating such thick layers with high-viscous slurries poses significant challenges, particularly in maintaining uniformity and avoiding coating defects like edge formation, also called side-edge elevation.

FOM Technologies slot-die coating machines are designed to meet these challenges head-on. Equipped with state-of-the-art ovens and user-centric software, these machines provide unparalleled control over the drying process, which is crucial when working with thick, high-viscous slurries. The ability to set different temperatures in each oven ensures that the solvent evaporates evenly, leaving a uniformly dried electrode layer.

The drying process is particularly critical when dealing with high-viscous slurries. If a coat is dried too quickly, the binders and conductive additives may migrate to the surface, resulting in a layer with poor electrical contact with the substrate and reduced overall performance. Additionally, improper drying can lead to uneven porosity, affecting the lithium-ion batteries’ efficiency and durability.

Using FOM Technologies’ slot-die coaters, researchers and manufacturers gain full control over the coating process, effectively addressing the challenges of coating high-viscous battery electrode slurries. Whether developing coin cell batteries, small pouch cells, or large pouch cells, these machines ensure optimized electrode quality, enhanced energy density, and the advancement of modern battery technology.