New insight of in-situ generation of composite cathode by converting Na3V2(PO4)3@C to improve aqueous zinc-ion batteries? performance

The NASICON-structure Na3V2(PO4)3 is attracted lots of attention due to its three-dimensional ion diffusion channels, high discharging platform and small volume deformation, which has become the most potential cath-ode material candidates for aqueous zinc-ion batteries. Nevertheless, we found that NVP@C undergoes a struc-tural phase change which is converted to composite (V2O5 , NaV3(PO4)3 , Zn3V4(PO4)6) after 50 cycles in this study. Here, we exploited the in-situ generation of composite by cycling the NVP@C batteries at 60 degrees C for only 1 cycle (NVP@C-60 degrees C) to promote the performance of cathode material for aqueous zinc-ion batteries. The NVP@C-60 celcius display a high capacity of 164 mA h g-1 at 100 mA g-1 and excellent rate performance (155 mA h g-1 at 1000 mA g-1) are realized. This is the first reported in-situ generation of composite as a cathode material for aqueous zinc-ion batteries so far. This work breaks the original conventional thinking to present new insight to developing cathode materials for zinc energy storage.

Automated summary

The NASICON-structure Na3V2(PO4)3 has attracted attention for its ion diffusion channels, discharging platform, and volume deformation, making it a potential cathode material for aqueous zinc-ion batteries. However, this study found that NVP@C undergoes a structural phase change and converts to a composite after 50 cycles. By cycling the NVP@C batteries at 60 degrees C for only 1 cycle, the in-situ generation of composite (NVP@C-60 degrees C) was achieved, which exhibited high capacity and excellent rate performance.