The research project “SilKompAs” is part of the "Battery 2020 Transfer" initiative funded by the German Federal Ministry of Education and Research (BMBF) to develop climate-compatible energy storage systems for use in the industrial and mobility sectors.
Due to the ever-increasing demands on energy storage systems, research into new process routes and materials is essential. Solid-state batteries, especially those based on sulfide electrolytes, have emerged as a potential solution, although the final cell setup remains a subject to research. Si and Si-C composites represent a relevant option as an anode active material, not least due to the high theoretical capacity of 3,570 mAh g-1. On the process side, the extrusion of electrode slurries is already established in the production of lithium-ion batteries and enables a continuous dispersing process with high solid contents. The aim of the project is thus to develop a scalable, continuous process for the production of Si-C anode composites by means of extrusion through interdisciplinary cooperation between industry and science.
The project starts with the identification of the most promising materials and process routes by the consortium and the subsequent formulation of Si-C composite materials by SGL and the characterization of these in collaboration with EL-CELL. This is followed by method and parameter variations for suspension production using a laboratory scale extruder (iPAT) and an analysis of the first half-cells (EL-CELL, WWU, JLU). The knowledge obtained will be incorporated into the design and construction of a scaled extruder encapsulated in inert gas atmosphere by TE and MB. Finally, the production (iPAT) and characterization (iPAT, EL-CELL JLU, WWU) of full cells on the upscaling experiments will be carried out.
Subproject description (iPAT):
Compilation of potential Si and Si-C composites.
Identification and comparison of scalable process routes
Preparation and analysis of anode, separator and cathode suspensions
Fabrication of electrodes and separators including mechanical, electrical and electrochemical analysis of coatings
Construction and evaluation of full cells
Continuous incorporation of gained knowledge through constant feedback loops