Dense MoS2 Micro‐Flowers Planting on Biomass‐Derived Carbon Fiber Network for Multifunctional Sulfur Cathodes

Abstract The significant challenge in lithium‐sulfur batteries (LSBs) arises from low conductivity of sulfur cathode, loss of active sulfur species due to less anchoring sites and sluggish redox kinetics of lithium polysulfides (LPSs). Herein, the dense MoS 2 micro‐flowers assembled by cross‐linked 2D MoS 2 nanoflakes planting on biomass‐derived carbon fiber (CF) network (MoS 2 /CFs) are fabricated as multifunctional sulfur cathodes of LSBs. The 2D MoS 2 nanoflakes supported on CF provide abundant anchoring sites for strong adsorption, while the 3D flowerlike structure prevents lamellar aggregation of 2D MoS 2 nanoflakes. Importantly, the dense MoS 2 micro‐flowers planting on the network weaved by biomass‐derived CFs ensures the high electronic conductivity of the MoS 2 /CFs composite, sufficient electrode/electrolyte interaction, fast electron and Li + transportation. Moreover, the CF network weaved from cost‐effective tissue paper reduces the cost of LSBs. Thus, the S‐MoS 2 /CFs cathode exhibits a high rate capability (1149 and 608 mA h g −1 are obtained at 0.2 C and 4 C, respectively), excellent cyclic performance with ∼75% capacity retention and 99% Coulombic efficiency at 2 C after 500 cycles, corresponding to ∼0.05% capacity fading per cycle only, as well as structure integrity during the discharge/charge process.