CoSe2 nanoparticles-decorated carbon nanofibers as a hierarchical self-supported sulfur host for high-energy lithium-sulfur batteries

Lithium-sulfur (Li-S) batteries have gained widespread attention owing to their high theoretical energy density and low cost. However, the commercial application of these is hindered by severe shuttle effect slow redox reaction kinetics polysulfides. In this study, a hierarchically porous membrane consisting CoSe2 nanoparticle-decorated carbon nanofibers containing nanotubes (CoSe2@CNF/CNT) constructed as self-supported sulfur host for Li-S batteries. The hierarchical conductive network CNFs/CNTs with N-doped facilitates electron/ion transport provides sufficient space mitigate volume expansion lithium polysulfides (LiPSs). Moreover, modified nanoparticles serve both chemical trappers electrocatalysts, chemically anchoring LiPSs accelerating inhibit effect. As result, an initial specific discharge capacity 1098.8 mA h g−1 achieved at 1 C. Importantly, cathode exhibits superior cycling stability decay rate 0.06% over 500 cycles. This work offers feasible approach designing multi-functional hosts high-energy-density