The Crystallinity of Metal Oxide in Carbonized Metal Organic Frameworks and the Effect on Restricting Polysulfides

Abstract Metal/carbon nanohybrids show promise for alleviating polysulfides shuttling in lithium‐sulfur batteries. However, the synergetic effect between amorphous metal and carbon to restrict the migration of polysulfides is still far from fully understood. Herein, two porous metal/carbon nanohybrids with different crystallinity metal oxides components (amorphous Al₂O₃ and crystal Fe₃O₄) have been prepared through pyrolysis of the MOF precursors, which are adopted as a sulfur support to impede the polysulfides shuttling. As expected, the amorphous Al₂O₃ with nitrogen‐doped porous carbon exhibits an attractive durability at 1 C over 1000 cycles, meanwhile, the coulombic efficiency could maintain at 97.5%. Compared to it, crystal Fe₃O₄ shows an inferior electrochemical performance, which is attributed to the amorphous structure that can accelerate ions diffusion and charge transfer to improve the rate performance and capacity. The distinguished discharge performance of the design will be potentially used to develop applicable Li‐S batteries.