Journal
CHEMISTRY OF MATERIALS
Volume 23, Issue 16, Pages 3593-3600Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm200450y
Keywords
olivine; Na-ion battery; topotactic; low-temperature synthesis; cathode material
Funding
- NSERC
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New metastable olivine phases of sodium metal phosphates, Na[Mn1-xMx]PO4 (M = Fe, Ca, Mg), nanorocls are synthesized by a simple solid-state reaction at low temperature (<= 100 degrees C) by means of a topotactic molten salt reaction that converts NH4[Mn1-xMx]PO4 center dot 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 NaMn0.5Fe0.5PO4 was confirmed by electrochemical characterization.
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