3R-NbS 2 as a highly stable anode for sodium-ion batteries.

Anode materials for advanced sodium-ion batteries (SIBs) require major improvements with regard to their cycling stability, which is a crucial parameter for long-term battery operation. Herein, we report 3R-NbS 2 , synthesised by a simple solid-state annealing route, as an anode for SIBs with remarkable cycling stability for 2500 cycles at 0.5 A g -1 . The stable nature of the NbS 2 anode was attributed to its dominant capacitive behaviour.