Interface engineering of bimetallic sulfide/carbon composite anode with heterostructures and sulfur bridges for cost-effective all manganese-based sodium-ion batteries

Designing anode materials that simultaneously achieve high capacity, structural stability, and fast kinetics remains a critical challenge for sodium-ion (Na-ion) batteries. Herein, we propose a targeted interface engineering strategy construct a carbon decorated ZnS-MnS/C (ZMSC) composite anode featuring bimetallic sulfide heterostructures and interfacial sulfur-bridged bonds for all Mn-based Na-ion batteries (AMSIBs). The intrinsic differences in bandgap and electronegativity induce a built-in electric field at their interface, promoting charge redistribution and heterostructure formation. Carbon decoration establishes sulfur-bridged bonds that tightly anchor active metal nanoparticle to the carbon matrix, enhancing interfacial coupling and effectively suppressing structural degradation. Such synergistic design achieves a remarkable reversible capacity of 400 mAh g⁻¹ over 2000 cycles at 10.0 A g⁻¹. When paired with NaMn₂O₄ cathode, the obtained AMSIBs demonstrated excellent performance and stability, underscoring its practical viability for the development of cost-effective and high-performance Na energy storage systems.