Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 15, Issue 31, Pages 13032-13037Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3cp52408f
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Funding
- Department of Energy Office of Basic Energy Science grant [DE-SC0005397]
- Robert A Welch Foundation, Houston, Texas [F-1066]
- National Natural Science Foundation of China [21063014]
- U.S. Department of Energy (DOE) [DE-SC0005397] Funding Source: U.S. Department of Energy (DOE)
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A Na3V2O2(PO4)(2)F/reduced-graphene-oxide (RGO) sandwich structure has been synthesized by a facile one-step solvothermal method. Cubic Na3V2O2(PO4)(2)F nanoparticles are homogeneously trapped between conductive RGO sheets during its growth and assembled into a compact sandwich structure, which allows the electrically insulating Na3V2O2(PO4)(2)F nanoparticles to be wired up to a current collector through the underlying graphene conducting layers. As a sodium-insertion cathode material, the structure exhibits a high reversible capacity of 120 mA h g(-1) at a discharge rate of C/20 with a capacity retention of 100.4 mA h g(-1) at 1 C and an excellent cyclic retention of 91.4% after the 200th cycle at C/10. These results highlight the importance of anchoring Na3V2O2(PO4)(2)F on a conducting scaffold for maximum utilization of the electrochemically active Na3V2O2(PO4)(2)F particles in a high-performance sodium-ion battery.
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