Hierarchical Carbon Framework Wrapped Na3V2(PO4)(3) as a Superior High-Rate and Extended Lifespan Cathode for Sodium-Ion Batteries

Hierarchical carbon framework wrapped Na3V2 (PO4)(3) (HCF-NVP) is successfully synthesized through chemical vapor deposition on pure Na3V2(PO4)(3) particles. Electrochemical experiments show that the HCF-NVP electrode can deliver a large reversible capacity (115 mA h g(-1) at 0.2 C), superior high-rate rate capability (38 mA h g(-1) at 500 C), and ultra-long cycling stability (54% capacity retention after 20 000 cycles).