Anisotropically grown Li3V2(PO4)3 nanocrystals, which are highly dispersed and directly impregnated on the surface of a carbon nanofiber (CNF), were successfully synthesized via a two-step synthesis process: i) precipitation of nanoplated V2O3 precursors (20-200 nm); ii) transformation of the V2O3 precursor into Li3V2(PO4)3 nanoplates without size change. The direct attachment of the Li3V2(PO4)3 nanocrystals to the carbon surface improves the electronic conductivity and Li+ diffusivity of the entire Li3V2(PO4)3/CNF composite, simultaneously producing a mesoporous network (pore size of approximately 10 nm) that acts as an electrolyte reservoir owing to the pillar effect of the impregnated Li3V2(PO4)3 crystals. This ideal Li3V2(PO4)3/CNF nanostructure enabled a 480C rate (7.5 seconds) discharge with 83 mA h g-1, and 69% of capacity retention at the slowest discharge rate (1C). Such an ultrafast charge-discharge performance opens the possibility of using Li3V2(PO4)3 as a cathode material for ultrafast lithium ion batteries with a stable cycle performance over 10,000 cycles at a 10C rate, maintaining 85% of the initial capacity.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Renewable Energy, Sustainability and the Environment
- Surfaces, Coatings and Films
- Materials Chemistry