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Scalable production of nitrogen-doped carbons for multilayer lithium-sulfur battery cells

 
: Kensy, Christian; Härtel, Paul; Maschita, Johannes; Dörfler, Susanne; Schumm, Benjamin; Abendroth, Thomas; Althues, Holger; Lotsch, Bettina Valeska; Kaskel, Stefan

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Carbon 161 (2020), pp.190-197
ISSN: 0008-6223
European Commission EC
H2020; 666157; ALISE
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
03XP0030; StickLiS
English
Journal Article
Fraunhofer IWS ()
porous carbon; pouch cell; cathode; lithium sulfur battery; nitrogen doping

Abstract
Lithium-sulfur (Li–S) batteries are among the targeted candidates for future generation secondary batteries with high specific energy. Herein, a scalable synthesis is presented to produce highly porous, nitrogen-doped carbons from a commercial carbon black material by melamine impregnation and subsequent thermolysis. The process up-scaling up was demonstrated at > 100 g batch level. The nitrogen doping was controlled through pyrolysis temperatures and carbon to melamine ratio. The sulfur-carbon cathodes exhibit an enhanced cycle life at a moderate electrolyte to sulfur ratio of 7 μL mgS−1. In particular, under lean conditions at low electrolyte amount of 5 μL mgS−1, the nitrogen functionalities improved active material utilization and capacity retention significantly. The nitrogen-doped scaffold was integrated into five-layered prototype cell (71 × 46 mm2) with a capacity of up to 0.87 Ah reaching a specific energy density of 238 Wh kg−1 on stack level. These results provide new insights into realistic application of nitrogen-doped carbons on pouch cell level.

: http://publica.fraunhofer.de/documents/N-575303.html