Facile Synthesizing Yolk-Shelled Fe3O4@Carbon Nanocavities with Balanced Physiochemical Synergism as Efficient Hosts for High-Performance Lithium–Sulfur Batteries

The severe “shuttle effect” of dissolved polysulfide intermediates and the poor electronic conductivity sulfur cathodes cause capacity decay lithium–sulfur batteries impede their commercialization. Herein, we synthesized a series well-designed yolk-shelled Fe3O4@carbon (YS-Fe3O4@C) nanocavities with different proportions Fe3O4 as efficient hosts to stabilize intermediates. nanocavity architectures were prepared through facile method, which could effectively confine active materials achieve high conductivity. intermediate shuttle was successfully suppressed by physiochemical synergism effect combining retention carbon shells adsorption nanoparticle cores. highly conductive shell provides pathways for fast electron transportation. Meanwhile, visible evolution reversible electrochemical reaction are revealed in situ X-ray diffraction. With balanced merits enhanced electrical optimal cores, S/YS-27Fe3O4@C cathode (Fe3O4 accounts 27 wt% YS-Fe3O4@C) had best performance, exhibiting specific 731.9 mAh g−1 long cycle performance at 1 C (capacity fading rate 0.03% over 200 cycles).