Cornell team proposes new scheme for Lithium-sulfide battery cathodes
Cornell team proposes new scheme for Lithium-sulfide battery cathodes 31 December 2012 Discharge capacity (left axis) and Coulombic efficiency (right axis) of the Li2 S-C cathode as a function of cycle number. A fixed current density of 200 mA g-1 was used for these measurements. Credit: ACS, Guo et al. Click to enlarge. Researchers at Cornell University are proposing a new scheme for cathodes for lithium-sulfide batteries (earlier post ) to prevent lithium polysulfide dissolution and shuttling during electrochemical cycling. Their approach, described in a paper published in the Journal of the American Chemical Society , creates composites based on lithium sulfide uniformly dispersed in a carbon host, which serve to sequester polysulfides. Li-sulfur batteries—which conventionally use elemental sulfur (with conductive additives) as the cathode, an aprotic liquid electrolyte...