Solid state sUlfide Based LI_Metal batteries for EV applications
4 years (01.05.2020 – 30.04.2024)
Funding: 7,892,792.50 €
Institute for Particle Technology (iPAT), TU Braunschweig
Fraunhofer Institute for Surface Engineering and Thin Films (Fraunhofer IST)
The SUBLIME project is dealing with the scalable production of sulfide based solid-state batteries for applications in electromobility.
In SUBLIME, a sulfidic solid electrolyte (based on the argyrodite Li6PS5Cl) was developed on the material side and the synthesis process was scaled up to produce a total amount of 10 kg. In parallel, protective coatings for the lithium anodes and initial formulations for powder-based separators and cathodes were researched. Building on these results, the larger-scale production of the components followed using film-based, scalable methods. In addition to wet extrusion, the possibilities of dry processing and infiltration were tested. Since suspension-based production by extrusion proved to be most promising, a large number of layers was produced and pouch cells assembled using this process. Throughout the project, there is a close exchange of material and electrode samples between the partners with the aim of cross-component adaptation and validation of experimental and analytical results.
The tasks of the iPAT and Fraunhofer IST include:
Establishment of a process route for continuous suspension production using a twin-screw extruder in a glovebox
Coating of cathodes and separators based on the sulfidic solid electrolyte Li6PS5Cl
Fabrication of mono layer pouch cells with a capacity of up to 40 mAh
Analysis of structural, mechanical and (electro)chemical properties
In the course of the project, the task of another project partner to build multilayer cells with a total capacity of 1 Ah was taken over. While iPAT manufactures cathode and separator layers along the process chain from dry mixing to calendering, Fraunhofer IST is responsible for assembling the pouch cells.