Synergistic effect of cobalt, nitrogen-codoped hollow carbon sphere hosts for high performance lithium sulfur batteries

Abstract

Co, N@CPDA-HCS exhibits better electrochemical performance due to the embedding of cobalt on the special structure as a host for sulfur.

A conductive framework embedded with cobalt-doped vanadium nitride as an efficient polysulfide adsorber and convertor for advanced lithium–sulfur batteries

“…34 The presence of C-N bonds changed the nonpolar surfaces of graphitic carbon and thus enhanced their affinity to LiPSs. 35 In addition, the Raman scattering spectra (Fig. 3d) were obtained to confirm the degree of graphitization for the Co-VN/ NC, VN/NC and NC, and two typical peaks around 1340 (D-band) and 1590 cm À1 (G-band) indicate the existence of disordered carbon and graphitic carbon, respectively.…”

“…34 The presence of C–N bonds changed the nonpolar surfaces of graphitic carbon and thus enhanced their affinity to LiPSs. 35…”

Understanding the interaction of N-doped graphene and sulfur compounds in a lithium–sulfur battery: a density functional theory investigation

“…The shuttle effect created by the high solubility of Li 2 S x in the electrolyte leads to the irreversible loss of sulfur, large volume changes in the cathode and corrosion of the lithium metal anode, which seriously affect the Coulombic efficiency, rate performance and cycling stability of LSBs. 8,9 One of the most common strategies to enhance electrical conductivity and restrain the shuttle effect is to design composite cathodes consisting of sulfur and carbon-based supporting materials, such as graphene, 10,11 micropores carbon, 12 porous carbon, 13 carbon fibers, 14 carbon nanotubes (CNTs), 15 and carbon nanocages. 16 However, the nonpolar carbonaceous hosts provide weak physical confinement, which is insufficient for mitigating Li 2 S x diffusion over a long lifespan.…”