Hierarchical Ni₃S₂/CoS₂ Nanosheet Arrays on Ni Foam as Superior Anode Materials for Lithium-Ion Batteries

The fabrication of bimetallic sulfide integrated anodes possessing stable configurations is deemed a potent tactic to surmount the drawbacks of inadequate charge transfer and pronounced volume expansion afflicting single metal sulfides within lithium-ion batteries (LIBs). Herein, the hierarchical bimetallic sulfide Ni 3 S 2 /CoS 2 nanosheet arrays on Ni foam (NF) are procured via a two-step hydrothermal growth protocol. The design of an integrated anode with nanosheet array architecture and the synergistic interaction of bimetallic ions can furnish copious electroactive sites, expedite ion/electron translocation, accelerate the dynamic reaction, and consequently avert structural impairment. The Ni 3 S 2 /CoS 2 /NF anode manifests a specific capacity of 2307 mAh g –1 at 0.64 A g –1 and sustains 80.4% of its capacity after 1000 cycles at 1.28 A g –1 . This discovery functions as a momentous benchmark for the exploitation of other bimetallic sulfides for LIBs.