Topochemical Synthesis of Sodium Metal Phosphate Olivines for Sodium-Ion Batteries
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- Topochemical Synthesis of Sodium Metal Phosphate Olivines for Sodium-Ion Batteries
- Lee, Kyu Tae; Ramesh, T. N.; Nan, F.; Botton, G.; Nazar, Linda F.
- cathode material; low-temperature synthesis; Na-ion battery; Olivine; topotactic
- Issue Date
- AMER CHEMICAL SOC
- CHEMISTRY OF MATERIALS, v.23, no.16, pp.3593 - 3600
- 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.
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