SUBLIME

Profile SUBLIME

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.

Further information on the SUBLIME project can be found on the homepage (https://sublime-project.eu/).

Contact:

Mattis Batzer
m.batzer(at)tu-braunschweig.de

Carina Heck
c.heck(at)tu-braunschweig.de