Facile synthesis of hierarchical porous Na3V2(PO4)3/C composites with high-performance Na storage properties

Porous Na3V2(PO4)(3)/C composites were prepared in situ via a simple solution method using various amounts of cetyltrimethylammonium bromide and glycine mixtures. Platelet particles with a thickness of similar to 150 nm were formed when 0.4 mmol cetyltrimethylammonium bromide and 0.4 mmol glycine were used, resulting in a high specific surface area (16 m(2) g(-1)) and porosity (0.05 cm(3) g(-1)) of the composites. In addition, the porous Na3V2(PO4)(3)/C composites presented good reversible cyclic voltammetry peaks with low hysteresis and delivered a high specific discharge capacity of 113 mA h g(-1), which decreased to 99 mA h g(-1) (capacity retention of 88.1%) after 200 cycles at the current rate of 1 C. The high rate capability (96 mA h g(-1) at 10 C) of the composites was attributed to their unique foamy microstructure, plate-like particles, and high electronic conductivity.

Automated summary

Porous Na3V2(PO4)(3)/C composites were prepared in situ using a simple solution method, resulting in a high specific surface area and porosity. The composites demonstrated good electrochemical performance with high specific discharge capacity and high rate capability.