MoS₂/CN/Fe_0.95S_1.05 with a Hierarchical Architecture as a Long-Durable Anode for Sodium Ion Batteries

Well-stocked and low-cost sodium resources have attracted increasing attention due to excessive consumption of lithium resources. Transition metal chalcogenides (TMCs) have been widely studied as anode materials for sodium ion batteries (SIBs) because of their high theoretical specific capacity, but capacity attenuation during the charge–discharge process and low initial Coulombic efficiency (ICE) are the main obstacles for the development of TMCs. In this work, MoS2/N-doped carbon (CN)/Fe0.95S1.05 with a hierarchical architecture was synthesized by a hydrothermal process, followed by an annealing process. Phase-change MoS2 was protected by N-doped carbon (CN) containing Fe0.95S1.05, and the synergistic effect caused by the establishment of a connection between MoS2 and Fe0.95S1.05 by CN greatly promotes the interface reaction and reaction kinetics. As a consequence, MoS2/CN/Fe0.95S1.05 exhibits a prominent ICE of 93.29% at 0.2 A·g–1, and even after ultralong cycling for 4700 cycles at 4 A·g–1, it can still maintain a high capacity of 323.3 mAh·g–1, reflecting the excellent long-lasting durability. This work fabricates a promising bimetallic sulfide material as an anode for SIBs with ultralong endurance.