3 years ago

Bottom–up assembly of strongly–coupled Na3V2(PO4)3/C into hierarchically porous hollow nanospheres for high–rate and –stable Na–ion storage

Bottom–up assembly of strongly–coupled Na3V2(PO4)3/C into hierarchically porous hollow nanospheres for high–rate and –stable Na–ion storage
Herein, a three–dimensional (3D) Na3V2(PO4)3–based hollow nanosphere with hierarchical pores (3DHP–NVP@C) has been firstly reported. Detailed studies reveal that this novel architecture is made up from the bottom–up assembly of carbon–coating NVP nanoparticles. The hierarchically porous structure offers ample space for the intimate contact between electrode/electrolyte and eliminates the disadvantageous reducing of effective surface areas in manufacturing the electrodes, as well as stabilizes the structure upon repeated sodium ions insertion/extraction, resulting to the barrier–free sodium ion diffusions and long–term cycling life. On the other hand, the graphitic carbon shells construct into a highly–conductive framework that can ensure the ultrafast electrons transfer. Consequently, extraordinary high–rate and ultralong–cycle capabilities that are superior to any other NVP–based material are obtained: the outstanding high–rate capacity retention (over 80% of the 1C capacity is retained at 400C), ultralong life span (90.9% and 92.5% capacity retention after 10,000 cycles at 1C and 5C), and extremely high–rate stability (80% capacity retention after 30,000 cycles at 50C), demonstrating its promising application in sodium ion battery.

Publisher URL: www.sciencedirect.com/science

DOI: S2211285517304317

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