In Situ Construction of Mo₂C‐MoS₂ Nanospherical Heterostructure for Accelerating the Kinetics of Lithium‐Sulfur Batteries

Abstract The interaction between catalysts and polysulfides plays a crucial role in the redox kinetics of lithium‐sulfur batteries (LSBs). However, the role of nanoscale heterostructures formed by non‐metal atoms in regulating the electronic state of catalysts is often overlooked. In this work, these electronic states are modulated by in situ constructing a Mo─S heterostructure in a Mo₂C nanosphere. The introduction of sulfur atoms forms the anion heterointerface, altering the coordination environment of interfacial Mo atoms and strengthening Mo─S interactions. This modification significantly enhances lithium polysulfide (LiPS) adsorption and conversion kinetics when using a Mo₂C‐MoS₂ heterostructure‐modified separator (Mo₂C‐MoS₂/PP) in LSBs. Furthermore, Mo₂C‐MoS₂/PP effectively suppresses the LiPS shuttle effect and improves cycling stability, achieving a low capacity decay rate of 0.036% per cycle over 500 cycles at 1C. This study proposes a comprehensive approach to modulate metal electronic states by non‐metal atoms nanoheterostructure, aiming to enhance the catalytic reaction kinetics of LSBs.