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Topochemical Synthesis of Sodium Metal Phosphate Olivines for Sodium-Ion Batteries
- Author(s)
- Lee, Kyu Tae, Ramesh, T. N., Nan, F., Botton, G., Nazar, Linda F.
- Issued Date
- 2011-08
- Citation
- CHEMISTRY OF MATERIALS, v.23, no.16, pp.3593 - 3600
- Abstract
- New metastable olivine phases of sodium metal phosphates, Na[Mn 1-xMx]PO4 (M = Fe, Ca, Mg), nanorods are synthesized by a simple solid-state reaction at low temperature (≥100 °C) by means of a topotactic molten salt reaction that converts NH 4[Mn1-xMx]PO4•H2O (M = Fe, Ca, Mg) to Na[Mn1-xMx]PO4. Their crystal structures are characterized via XRD Rietveld refinement and electron diffraction. A full range of solid solution behavior was observed for olivine Na1-xMn0.5Fe0.5PO4, in contrast to that of LiMPO4 (M = Fe, Mn) olivine materials, and is ascribed to ion size effects. The solid solution behavior of NaMn0.5Fe 0.5PO4 was confirmed by electrochemical characterization.
- Publisher
- AMER CHEMICAL SOC
- ISSN
- 0897-4756
- Keyword (Author)
- olivine, Na-ion battery, topotactic, low-temperature synthesis, cathode material
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