3:30 PM - *ES07.05.03
Advanced Carbon Materials for Lithium-Sulfur Batteries—From Basic Research to Pouch Cells
Fraunhofer IWS1,TU Dresden2
Lithium sulfur batteries are considered as the next generation batteries due to their high gravimetric energy density up to 350-400 Wh/kg. Highly porous carbon materials with surface areas up to 3000 m2/g play a key role for the performance of such systems. A key requirement is to achieve high sulfur loadings up to 75 wt. % in the cathode and high degree of sulfur utilization. In particular challenging is to identify new electrolytes to achieve high cycling stability. Electrolyte minimization is an often overlooked requirement to achieve high energy densities in prototype cells. The development of porous carbon materials for lithium sulfur batteries requires pore size and polarity tailoring.[1-8] Mesoporous carbon materials are ideally suited as sulfur host for the lithium sulfur batteries. Microporous carbons (d < 2 nm) show high sulfur utilization but the overall sulfur loading is limited to a maximum of about 50 wt % sulfur posing limitations to achieve a high gravimetric energy density. Hard carbons are highly promising anode materials to achieve up to 4000 cycles in a lithium sulfur battery with only minor degradation. Moreover, sodium sulfur batteries can operate with this concept at room temperature.[5,7] The presentation will give examples for pouch cell production, laser cutting, silicon anode integration  and fundamental advances for cathode evaluation .
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