The ASSB is the next generation technology, which receives a lot of attention as a promised candidate to replace conventional LIBs due to its higher energy in future. The current challenge is to scale up the production and manufacturing processes of each battery component, like the solid electrolyte (SE) and composite cathode. Due to the existing availability of polymeric materials as solid electrolytes on larger scale, the focus of research can be placed more on scaling up the processing. In large-scale production, it is advantageous to reduce production steps to a minimum to reduce production costs. Thus, we are investigating the solvent-free and dry process route of polymer-based solid state batteries by extrusion. This production method not only offers the possibility of large scale production, but also reduces potential process costs by eliminating the subsequent drying steps and solvent recovery.

In this work, we present a suitable experimental setup for the investigation of the relationship between process parameters and product quality of polymer-based SE. This experimental setup ranges from kneading experiments to measure small quantities to extrusion experiments for the production in larger quantities. For the extrusion process, a co-rotating twin-screw extruder is used in an argon filled glovebox. The extrusion process allows us to produce polymer-based SEs in a dry and scalable process. We focus on the influence of process parameters and screw design on the process and product quality by evaluating the monitored process parameters during extrusion. From additional characterization methods, i.e. microscopy and electrochemical testing, the implementation of kneading elements in the screw design is necessary to receive the most stable process and the best mixing quality of the components.