sulfurized polyacrylonitrile (span) with a “solid-solid” conversion mechanism in carbonated-based electrolyte eradicating the polysulfides shutting issue is considered as an ideal cathode for stabilizing lithium sulfur (li-s) batteries. however, the sluggish reaction kinetics and less sulfur content of the span limits its practical application. herein, the mos2 doped span (mos2@span) is demonstrated to rapidly accelerate the solid-solid conversion kinetics of span for remarkably boosting high-power and long-life li-s batteries. benefitting from the accelerated lithium-ion (li ) transfer rate, a fast ion transport channel and enhanced redox reaction kinetics of sulfur to li2s2/li2s is realized via mos2 catalysis, and excellent electrochemical performance is achieved. consequently, mos2@span delivers high capacity of 626 mah g-1 at 0.1 a g-1, and simultaneously shows ultralong cycling life of 500 cycles with only 0.089% capacity decay rate at 2 a g-1. moreover, a superb capacity of 321 mah g-1 at ultrahigh current density of 5 a g-1 is offered, outperforming most of reported span cathodes. this work provides a general and reliable strategy on the reliable design of span cathode for high-rate and long-term li-s batteries.
