Pilotaxitic Na1.1V3O7.9 nanoribbons/graphene as high-performance sodium ion battery and aqueous zinc ion battery cathode

For the development of high-performance sodium and aqueous zinc ion batteries, the exploitation of suitable cathode materials is urgently needed. In this work, pilotaxitic Na1.1V3O7.9 nanoribbons/graphene (Na1.1V3O7.9@rGO) have been prepared. As cathode for sodium ion battery, the Na1.1V3O7.9@rGO delivers high capacities at different rates. Stable capacity of 84.8 mA h g(-1) is obtained at 1 A g(-1) after 500 cycles, corresponding to a low capacity fading rate of 0.015% per cycle. The ex-situ XRD and TEM results demonstrate good structural stability of Na1.1V3O7.9@rGO. Most importantly, the layered structure of Na1.1V3O7.9@rGO is firstly employed as cathode for aqueous zinc ion battery. This composite can deliver a high capacity of similar to 220 mA h g(-1) at 300 mA g(-1), as well as good cyclic stability, which suggests the sodium vanadates may be a good cathode candidate for aqueous zinc ion battery.