Na0.33V2O5 nanosheet@graphene composites: Towards high performance cathode materials for sodium ion batteries

• Na0.33V2O5@graphene composites were explored for sodium storage for the first time.
• Na0.33V2O5@graphene composites with sandwich-like nanostructures were synthesized.
• The composites exhibit excellent electrochemical performance as cathodes.

Na0.33V2O5 nanosheet@graphene composites were explored as cathodes for sodium ion batteries for the first time. Here, Na0.33V2O5 nanosheet@graphene composites with special sandwich-like nanostructures were synthesized. The composites exhibit high discharge capacity (of ca. 213 mA h g−1 at 20 mA g−1), good cycling stability (with a capacity retention of 83.3% at 50 mA g−1 after 100 cycles) and desirable rate performance (88.2 mA h g−1 at an extremely high current density of 6000 mA g−1) as cathodes for sodium storage. Notably, the as-synthesized Na0.33V2O5 nanosheet@graphene composites show much higher specific capacity and better rate capability than those reported Na0.33V2O5 materials which were usually tested at relatively low currents (no more than 200 mA g−1) and showed low capacities (less than 150 mA h g−1).

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