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Silicon based Anodes for sulfide based All-Solid-State-Batteries
Poster Exhibition
Solid state batteries

Sulfide based All-Solid-State-Batteries (ASSBs) are favored to be one of the next technology development steps of Lithium-Ion-Batteries (LIBs). By substituting the liquid electrolyte, batteries become non-flammable and have an extended operating temperature range. Therefore, allowing new concepts of battery systems in the field. Especially, sulfide solid-state electrolytes are very promising due to their high ductile behavior, which enables cheaper manufacturing methods. Right now, the research of sulfide ASSBs mainly focuses on the cathode side using indium or lithium-indium as an anode with the idea to substitute it with lithium in the end. To delink the ASSB from the lithium anode, silicon can be used as an alternative. This will allow an earlier access to manufacturing of ASSBs, since the same processes can be used for cathodes and anodes. Additionally, the composition of the battery would allow higher current densities, due to the formation of an interpenetrating network, which provides an increased contact area, inside the anode. To investigate the electrochemical behavior of silicon anodes, slurries for anode and cathode incorporated with sulfide Argyrodite-type electrolyte (Li6PS5Cl) were formulated and printed on top of the appropriate current collectors (Al or Cu). For cathodes LiNi0.6Co0.2Mn0.2O2 (NMC622) and for anodes silicon carbon composites (Si/C) were used. Inside a special compression cell these two layers were attached on top/bottom of pelletized LPSCl-powder. Finally, the cells were tested via impedance spectroscopy and galvanostatic cycling. Electrochemical behavior was investigated with the focus on the impact of external temperature and pressure.

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M. Argente Manzur, D. Wilhelm, A. Georg, I. Krossing and D. Biro