German team reconfigures Li-S battery for improved performance; new porous conductive separator coating
Researchers in Germany report significant improvement in specific capacity and cycling stability of “reconfigured” Li-S cells compared to a standard cell setup. At a constant charging rate of C/5, cells with their modified separator showed 2.5 times higher residual capacity (1016 mAh g−1) than cells with pristine separator (405 mAh g−1).
A paper on their work is published in the Journal of Power Sources.
Instead of generating a carbon/sulfur composite cathode by melt infiltration, the researchers coated a highly porous, conductive nitrogen-rich carbon material (TNC) onto a commercial polypropylene separator foil. The thin conductive coating of TNC on the separator enables the application of very simple sulfur/carbon black cathodes.
Because the melt infiltration of sulfur in a porous host material becomes unnecessary, electrode processing is significantly simplified.
Ulrich Stoeck, Juan Balach, Markus Klose, Daniel Wadewitz, Eike Ahrens, Jürgen Eckert, Lars Giebeler (2016) “Reconfiguration of lithium sulphur batteries: Enhancement of Li–S cell performance by employing a highly porous conductive separator coating”, Journal of Power Sources, Volume 309, Pages 76-81 doi: 10.1016/j.jpowsour.2015.11.077