Ultra-long cycle life of sodium-ion batteries in VS4-G nanocomposite structure

•VS4-G stacked nanosheets structure was synthesized by hydrothermal method.•The VS4-G nanocomposite has ultra-long cycle life for sodium-ion batteries.•The stacked composite nanosheets structure is very favorable for the infiltration and dispersion of electrolyte.

Herein, we report that the vanadium sulfide (VS4) nanosheets were stacked on reduced graphene oxide (RGO) nanocomposite (marked as VS4-G) synthesized by facile hydrothermal method. The as-prepared VS4-G nanocomposite demonstrated a stable capacity of about 463 mAh g−1 at 100 mA g−1 up to 100 cycles and ultra-long cycling life (700 cycles) for sodium-ion batteries (SIBs). A good performance because that this stacked composite nanosheets structure is very favorable for the infiltration and dispersion of electrolyte.

Graphical abstractDownload high-res image (291KB)Download full-size image