Lithium-sulfur batteries have applications ranging from portable electronics to electric vehicles.
Sulfur-based batteries provide an alternative to conventional lithium based batteries with unstable electrolytes. Sulfur-based batteries have a high theoretical specific capacity of 1,672 mAh/g and energy density of 2600 Wh/kg. However, practical applications of sulfur-based batteries remain a challenge due to their low utilization and capacity fading. This technology overcomes this by creating a sulfur composite electrode with high density and loading of active material.
This technology uses three different materials: sulfur, bis-(trifluoromethane)sulfonamide lithium salt (LiTFSI), and carbon nanotubes. All three materials are mixed by mechanical grinding before being pressed into 3/8in. diameter pellets under 100MPa. The pellets are then heated under argon at 160oC for 24h. The resulting cathode composite consists of (40 wt%), LiTFSI (10 wt%) and CNT (50 wt%) and has a specific capacity of 867 mAh/g. The LiTFSI-S/CNT electrode also has a Coulombic efficiency of >93% over 50 cycles.
Increases battery cyclability
Increases battery capacity