| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1523926 | Materials Chemistry and Physics | 2011 | 5 Pages |
Li3V2(PO4)3/C nanoparticles are prepared by spray pyrolysis. Particles formed from spray solutions containing citric acid and ethylenediaminetetraacetic acid (EDTA) as chelating agents are large and hollow with thin walls. The optimum concentrations of citric acid and EDTA are each 0.1 M. Powders subsequently treated at 700 °C under a reducing atmosphere have particles of single phase, monoclinic Li3V2(PO4)3. The Li3V2(PO4)3/C powders contains 14.9 wt% carbon. The hollow structures are easily pulverized into nanoparticles by simple milling process. However, Li3V2(PO4)3 powder formed from spray solution without chelating agent has larger, aggregated structures. Both powders’ charge curves show four plateaus at ca. 3.62, 3.70, 4.08 and 4.55 V. The initial discharge capacities of the Li3V2(PO4)3/C powders at constant current densities of 0.1, 1 and 3 C were 147, 122 and 86 mAh g−1, respectively. The capacity retention of the Li3V2(PO4)3/C nanoparticles at a high current density of 1 C after 100th cycle was 78%.
Graphical abstractLi3V2(PO4)3/C nanoparticles are prepared by spray pyrolysis introducing new concept. The precursor powders with hollow and thin wall structure formed from spray solution containing citric acid and ethylenediaminetetraacetic acid (EDTA) as chelating agents are easily pulverized into Li3V2(PO4)3/C nanoparticles by simple milling process. The Li3V2(PO4)3/C nanoparticles had high initial discharge capacity of 147 mAh g−1 and good cycle property.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Li3V2(PO4)3/C nanoparticles are prepared by spray pyrolysis from spray solution containing chelating agents. ► The precursor powders with hollow structures are easily pulverized into nanoparticles by simple milling process. ► The Li3V2(PO4)3/C nanoparticles had high initial discharge capacity of 147 mAh g−1 and good cycle property.
