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Solution-based chemical process for synthesis of highly active Li2S/Carbon nanocomposite for lithium-sulfur batteries

: Strubel, Patrick; Althues, Holger; Kaskel, Stefan


ChemNanoMat 2 (2016), Nr.7, S.656-659
ISSN: 2199-692X
Bundesministerium für Bildung und Forschung BMBF
03X4637; BamoSa
Battery mobile in Saxony
Fraunhofer IWS ()
electrochemical; radiational; Thermal Energy Technology

A novel method for the preparation of Li2S integrated into porous carbon black as host material by using a facile solution-based chemical process is described. Li2S was synthesized by disproportionation of a Li2S6 polysulfide solution. The combination of a homogeneous Li2S distribution with small Li2S particle size and good contact with the carbon surface leads to ideal properties for the application in high-energy-density long-cycle-life lithium-sulfur batteries. An initial discharge capacity of 1259 mA h g−1sulfur with good cycle stability as well as low polarization are achieved, rendering the novel method particularly suitable for application in full cells with silicon- or carbon-based anodes, which are used to overcome the main limitations observed using metallic lithium as anode in lithium-sulfur batteries.