Versatile insertion capability of Na1.2V3O8 nanobelts in aqueous electrolyte solutions
Sequeira, C. A. C.
Mentus, Slavko V.
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Single phase nanobelt-like Na1.2V3O8 was synthesized by precipitation from aqueous solution of V2O5, H2O2 and NaOH, and subsequent annealing at 400 degrees C. The product was characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. As measured by both galvanostatic charging/discharging and cyclic voltammetry methods, in air-equilibrated equeous electrolyte solutions containing nitrates of lithium, sodium and magnesium, this compound displayed fast inter- calation/deintercalation reactions. The galvanostatic charging and discharging curves observed at rates ranging 500-7000 mA g(-1), did not display clear plateaus characteristic of phase changes. The discharging capacities were found to range 101-35, 55-17 and 67-22 mAh g(-1) for Li, Na and Mg intercalation, respectively. By cyclic voltammetry, for the sweep rates increasing in the range 5-400 mV s(-1) (roughly 9-700 C), the capacity was found to decrease within the limits 63-35 mAh g(-1) fo...r Li+ intercalation, and 40 -11 mAh g(-1) for Na+ and Mg2+ intercalation, respectively. By analyzing the dependence log (current) versus log (sweep rate), the interval of potentials corresponding to preferably diffusion control of intercalation/deintercalation processes was determined. (C) 2014 Elsevier Ltd. All rights reserved.
Keywords:Aqueous solutions / Intercalation kinetics / Nanobelts / Na1.2V3O8 / Soft chemistry synthesis
Source:Electrochimica Acta, 2014, 147, 167-175
- Lithium-ion batteries and fuel cells - research and development (RS-45014)
- Serbian Academy of Sciences and Arts, Portuguese Foundaton for science and Technology (Fundacao para a Ciencia e a Tecnologia, FCT)