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Poster-No.

P5-061

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With today’s product requirements, cost pressure and increasing environmental awareness, the conservation of resources is a necessity for material-efficient, resource-conserving, and time-, quality- and performance-optimized battery production. The initial drying process of the coating can be identified as a significant cost and emission source due to high energy demands resulting from inefficiencies and heat losses. Shortening drying length, process and ramp-up times would also offer significant advantages in process control and flexibility. As a measure to mitigate disadvantageous process properties, innovative drying processes are becoming the focus of attention. In particular, the use of radiation to introduce energy to the thin film can be expected to optimize efficiency, drying time, drying distance and process costs due to its high energy density and favorable absorption properties. In this contribution the potential of innovative use of infrared and laser radiation for energy input into the coating is being investigated in principle, as well as the similarities and differences of the methods. The target is to achieve optimized process control with a reduction in energy consumption, drying distance, and drying time while maintaining comparable qualitative coating properties. Thereto radiating modules are placed between the coating-module and the convection oven. By solely using radiation for drying, in so-called stand-alone drying, the process ivaluated against the benchmark of convection drying. Furthermore, a sequential combined drying process, so called hybrid drying, is being looked at and compared against the conventional and innovative stand-alone practices. By combining radiation and convection, both rapid initial heating of the electrode film and sufficient solvent transport from the drying area can be achieved. This allows greatly accelerated solvent evaporation without significant loss of quality, reducing either the throughput times or the drying distances. Changes in quality due to drying defects are being quantified by the physical properties of the coating (adhesion, cohesion, conductivity, surface quality, additive distribution). By considering the technologies both individually and jointly, it is possible to not only compare the drying products but also the drying mechanisms. By analyzing the interdependencies and correlations of input and quality parameters, a statement on the operating conditions and recommendations for action may be given. A clear and comprehensible presentation of the correlations is achieved with a graphical process map on which the mathematical descriptions of the dependencies can then be based on. Not only do those provide insights into the theory of drying but also direct assistance for the practical application of innovative drying solutions. As an outlook, the further goals of the research and the utilization are presented, which are planned for further projects and a practical application of the research.