Rechargeable aqueous zinc ion battery based on NaV6O15 nanorods by surfactant-assisted method

Abstract

Vanadium oxides have a wide range of applications in aqueous zinc ion batteries due to their abundant resources and multiple valence states. However, the inherent low conductivity and structural instability of Vanadium-based materials often lead to the rapid degradation of their capacity. Consequently, stable microstructure and coordinated ion transport channels are essential to improve electrochemical performance. In this work, we report a surfactant-assisted hydrothermal method to obtain NaV6O15 with rod-like morphology and good dispersion. The surfactant-assisted NaV6O15 (NVO-I) electrode exhibited better cycle stability than the electrode without surfactant (NVO-II) during long cycles. The ordered morphology facilitated contact between the electrode and electrolyte, so the NVO-I electrode showed high electrochemical performance. The reversible capacity was 290.2 mAh g−1 at 0.1 A g−1, and the capacity retention was 95 % after 900 cycles at 1.0 A g−1. The surfactant-assisted hydrothermal strategy provides more options for developing stable and efficient AZIBs than other techniques.