Supersaturated bridge-sulfur and vanadium co-doped M0S 2 nanosheet arrays with enhanced sodium storage capability

The low specific capacity and sluggish electrochemical reaction kinetics greatly block the development of sodium-ion batteries (SIBs). New high-performance electrode materials will enhance development and are urgently required for SIBs. Herein, we report the preparation of supersaturated bridge-sulfur and vanadium co-doped MoS 2 nanosheet arrays on carbon cloth (denoted as V-MoS 2+x /CC). The bridge-sulfur in MoS 2 has been created as a new active site for greater Na + storage. The vanadium doping increases the density of carriers and facilitates accelerated electron transfer. The synergistic dual-doping effects endow the V-MoS 2+x /CC anodes with high sodium storage performance. The optimized V-MoS 2.49 /CC gives superhigh capacities of 370 and 214 mAh·g −1 at 0.1 and 10 A·g −1 within 0.4−3.0 V, respectively. After cycling 3,000 times at 2 A·g −1 , almost 83% of the reversible capacity is maintained. The findings indicate that the electrochemical performances of metal sulfides can be further improved by edge-engineering and lattice-doping co-modification concept.