Nanostructured sodium vanadate arrays as an advanced cathode material in high-performance sodium-ion batteries.

Highlights • Na 5 V 12 O 32 nanowire arrays were prepared by a facile hydrothermal method. • The nanowire arrays on titanium foil were used for the first time as a cathode in sodium-ion batteries. • Good initial charge/discharge capacities were 166 and 161 mAh·g−1 at a current density of 30 mA·g−1, respectively. • The electrode retained a reversible capacity of 130 mAh·g−1 after 40 cycles. Abstract Sodium vanadate (Na 5 V 12 O 32 or Na 1.25 V 3 O 8) nanowire arrays have been successfully prepared using a facile hydrothermal method with subsequent calcinations. The nanowire arrays on titanium foil annealed at 250 °C were used as a cathode material for sodium-ion batteries in the range of 2.0–4.0 V, producing initial charge and discharge capacity of 166 and 161 mAh·g−1, respectively. The electrode showed good cycle performance and moderate rate performance. These results indicated that Na 5 V 12 O 32 is a promising material for sodium-ion batteries. [ABSTRACT FROM AUTHOR]