摘要
Design of sulfur hosts for effective suppression of shuttling of lithium polysulfides (LiPS) is critical to achieving high-performance lithium-sulfur batteries (LSBs). Here, iron single atoms (SA(Fe))-decorated hollow porous carbon spheres (HPCS) composited with alpha-MnO2 nanowires are fabricated as a high-performance sulfur host for LSBs. This composite sulfur host takes advantage of Fe SAs to accelerate conversion reactions of LiPS, alpha-MnO2 nanowires to adsorb LiPS, and HPCS to boost charge transport and to confine LiPS, enabling high performance of LSBs. The HPCS@SA(Fe)/alpha-MnO2-based LSB exhibits a high initial specific capacity of 1095 mAh g-1 at 0.1C and maintains a decent specific capacity of 343 mAh g-1 at 2C. A high capacity retention rate of 81.3% after a 300 cycle operation at 1C is achieved, corresponding to a low average capacity decay rate of 0.062% per cycle. Construction of composite sulfur hosts, synergizing unique shuttling suppression functionalities of multiple constituent components, proves to be a promising strategy for development of advanced LSBs.