1 research outputs found
Building Lithium-Polycarbonsulfide Batteries with High Energy Density and Long Cycling Life
The polysulfide shuttling and restricted
kinetics of existing sulfur
cathodes of lithium–sulfur batteries need to be tackled. Herein,
we synthesized a polycarbonsulfide active material with an atomically
assembled π-conjugated 3D conductive matrix via the self-polymerization
of carbon disulfide (CS2) monomers. The as-synthesized
polycarbonsulfide features oligo-S heterocycles assembled to conjugated
conductive carbon chains. The coupled lithium-polycarbonsulfide battery
delivered a high capacity of 724.5 mAh g–1 at 1.0
C (corresponding to 827.3 Wh kg–1) with an ultralow
capacity decay rate of 0.032% per cycle, as well as high-rate capability
of 499.6 mAh g–1 at 3.0 C. Multiple ex situ spectroscopic
analyses revealed that the robust π-conjugated conductive polymeric
matrix was well preserved during repeated battery operation, which
efficiently tethered the discharge products to greatly restrict the
shuttling effect