N-Doped Porous Carbon Nanofibers Embedded With Tin Nanoparticles For High-Performance Li-S Batteries

Flexible N-doped porous carbon nanofibers embedded with TiN nanoparticles are prepared for cathode materials of lithium-sulfur (Li-S) batteries. A synergistic adsorption effect of lithium polysulfides (LiPSs) can be provided by the well-dispersed TiN nanoparticles, the heteroatomic doping, and the porous nanofibers structure. As a result, the as-prepared electrode can deliver a high reversible capacity of 990 mAh g(-1) after 120 cycles at 0.2 A g(-1) with coulombic efficiency approaching 100%. This work provides a simple and comprehensive strategy for the preparation of high-performance Li-S batteries.IMPACT STATEMENT We reveal the synergistic effect of the well-dispersed TiN nanoparticles, the heteroatomic doping, and the porous nanofibers structure endows the matrix material with best adsorption capability to polysulfides.