Dry coating process for battery electrodes: environmentally friendly, cost-efficient, space- and energy-saving.
The fabrication of heavy-duty electrodes is a promising approach to increase the energy density of Li-ion batteries, as they have a favorable ratio between active and inactive materials. However, modern tape casting processes with relatively high solvent content are limited in terms of layer thickness and drying process, which is associated with undesirable effects such as binder migration. Therefore, advanced processes for electrode fabrication are urgently needed.
Fraunhofer ISIT has developed a dry coating process that does not require any solvents at all. Drying the coated electrode slurry is an energy-intensive process. It also requires a large amount of space, as long drying distances are necessary for an optimal process result. The dry coating process developed by Fraunhofer ISIT eliminates the need for solvents. In addition, higher loadings are possible that exceed the range of conventional electrodes. This leads to significant cost savings and is more environmentally friendly.