基于FeCo2S4纳米线@碳布的柔性硫正极制备及电化学性能研究OA

Lithium-sulfur(Li-S)batteries have ultrahigh theoretical energy density,making them one of the most promising candidates for flexible energy storage.However,their widespread commercial-ization is still hindered by the severe polysulfide shuttle effect.FeCo2S4 nanowire arrays were grown in situ on carbon cloth(CC)via a two-step hydrothermal method to form FeCo2S4@CC,onto which a high-sulfur carbon/sulfur composite was loaded by slurry-coating to fabricate a flexible sulfur cath-ode(FeCo2S4@CC/S).A carbon/sulfur composite with high sulfur content was then loaded onto FeCo2S4@CC through a slurry-coating process,thereby fabricating a flexible sulfur cathode(FeCo2S4@CC/S).The results show that FeCo₂S₄ nanowires grow vertically on carbon fibers,forming a three-dimensional network that provides ample sulfur accommodation space and alleviates elec-trode volume expansion.Furthermore,FeCo2S4 nanowires exhibit catalytic activity and strong poly-sulfide adsorption,efficiently promoting Li2S8 conversion to long-chain Li2Sx and accelerating reac-tion kinetics.This significantly suppresses the shuttle effect and improves active material utilization.Compared with CC-based cathodes,the FeCo2S4@CC-based cathode exhibits better rate capability and cycling stability,delivering an initial discharge capacity of 938.3 mAh/g at 0.5 C with 90.1％re-tention after 140 cycles.Moreover,the assembled pouch cell can easily drive a small fan when bent,confirming its potential for flexible energy-storage applications.