Controlled Synthesis of NaV6O15 Nanorods with High Reversible Capacity and Excellent Cycling Stability

In this work, we demonstrate an effective method to improve capacitive performance of NaV 6 O 15 intrinsically by annealing. NaV 6 O 15 nanorods (NRs) prepared by a simple annealing treatment exhibit significantly improved electrochemical performance compared with the untreated NaV 6 O 15 electrode, and yield a high specific capacitance (402.8 F/g at 300 mA/g). Furthermore, the annealing treated nanorods show excellent rate capability and cycling stability (ca. 80% capacitance retention after 1000 cycles at a scan rate of 100 m V/s). Our results have confirmed that the annealing treatment has great influence on the capacitive performance of NaV 6 O 15 , which may be attributed to the intrinsic three dimensional (3D) tunneled structures of NaV 6 O 15 , and NR morphology. These findings may further broaden the application of NaV 6 O 15 -based materials for high performance supercapacitors (SCs), aqueous rechargeable lithium batteries and Li-ion capacitors.