The synthesis of yolk-shell structure assembled by MoS2@N, S-doped carbon for enhanced electrochemical performance

Two-dimensional layered transition metal dichalcogenides , such as molybdenum disulfide (MoS 2 ), have been considered promising anode materials for high-performance sodium-ion batteries. However, their poor conductivity and significant volume changes during Na + insertion/extraction often led to lower initial Coulombic efficiency and poor structural stability . To address these drawbacks, we innovatively synthesized yolk-shell structure with highly permeable, and porous characteristics through the high-temperature pyrolysis of the metal-organic hybrid nanospheres precursors. This process led to the formation of MoS₂@N, S-doped carbon (MoS 2 @NSC) assembly structure, which could control over the size, conductivity, and structural stability of the yolk-shell nanospheres , thereby significantly enhancing their electrochemical performance . The MoS 2 @NSC yolk-shell nanospheres exhibit excellent initial Coulombic efficiency (87.31 %) and outstanding rate capability. A reversible capacity of 691.7 mAh g −1 is retained after 600 cycles at a current density of 1 A g −1 . Notably, at 5 A g −1 , a capacity of 537 mAh g −1 is maintained after 1100 cycles, with a capacity retention rate of 97.2 %. This work provides a theoretical basis for the preparation of high-performance MoS 2 anode materials for sodium-ion batteries, showcasing a novel approach to overcoming the limitations of traditional electrode materials . • The novel yolk-shell structure assembled by MoS 2 @N, S-doped carbon was synthesized. • MoS 2 nanosheets (2-5 layers) were coated by N, S doped carbon, optimizing Na + diffusion and accelerating Na + migration. • The yolk-shell's uniform components ensure consistent electrical conductivity and electron transport across the electrode • This electrode exhibits a specific capacity of 523.6 mAh g −1 after 1100 cycles at 5 A g −1 .