ACS Applied Materials & Interfaces · 2017 · 188 citations · 41 references
Natural SciencesMaterials EngineeringMaterials ScienceElectrochemical EngineeringElectrochemistryNanomaterialsBattery MaterialsCathode MaterialsElectrochemical CellsElectrochemical Energy StorageElectrode MaterialsGraphene NanomaterialsCycle LifeCycling StabilityGraphene ElectrodesMicrospheresRate CapabilitySodium-ion BatteriesSodium-ion Battery ElectrodesSodium-ion Battery Materials
High voltage, high rate, and cycling-stable cathodes are urgently needed for development of commercially viable sodium ion batteries (SIBs). Herein, we report a facile spray-drying method to synthesize graphene-scaffolded Na 3 V 2 (PO 4 ) 3 microspheres (NVP@rGO), in which nanocrystalline Na 3 V 2 (PO 4 ) 3 is embedded in graphene sheets to form porous microspheres. Benefiting from the highly conductive graphene framework and porous structure, the NVP@rGO material exhibits a high reversible capacity (115 mAh g –1 at 0.2 C), long-term cycle life (81% of capacity retention up to 3000 cycles at 5 C), and excellent rate performance (44 mAh g –1 at 50 C). The electrochemical properties of a full Na-ion cell with the NVP@rGO cathode and Sb/C anode are also investigated. The present results suggest promising applications of the NVP@rGO material as a high performance cathode for sodium ion batteries.
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