Enabling the Electrochemical Activity in Sodium Iron Metaphosphate [NaFe(PO3)3] Sodium Battery Insertion Material: Structural and Electrochemical Insights.
Ritambhara GondSher Singh MeenaS M YusufVivekanand ShuklaNaresh K JenaRajeev AhujaShigeto OkadaPrabeer BarpandaPublished in: Inorganic chemistry (2017)
Sodium-ion batteries are widely pursued as an economic alternative to lithium-ion battery technology, where Fe- and Mn-based compounds are particularly attractive owing to their elemental abundance. Pursuing phosphate-based polyanionic chemistry, recently solid-state prepared NaFe(PO3)3 metaphosphate was unveiled as a novel potential sodium insertion material, although it was found to be electrochemically inactive. In the current work, employing energy-savvy solution combustion synthesis, NaFe2+(PO3)3 was produced from low-cost Fe3+ precursors. Owing to the formation of nanoscale carbon-coated product, electrochemical activity was enabled in NaFe(PO3)3 for the first time. In congruence with the first principles density functional theory (DFT) calculations, an Fe3+/Fe2+ redox activity centered at 2.8 V (vs Na/Na+) was observed. Further, the solid-solution metaphosphate family Na(Fe1-xMnx)(PO3)3 (x = 0-1) was prepared for the first time. Their structure and distribution of transition metals (TM = Fe/Mn) was analyzed with synchrotron diffraction, X-ray photoelectron spectroscopy, and Mössbauer spectroscopy. Synergizing experimental and computational tools, NaFe(PO3)3 metaphosphate is presented as an electrochemically active sodium insertion host material.
Keyphrases
- solid state
- visible light
- density functional theory
- metal organic framework
- gold nanoparticles
- low cost
- molecular dynamics
- ionic liquid
- high resolution
- aqueous solution
- molecularly imprinted
- label free
- magnetic resonance
- air pollution
- magnetic resonance imaging
- molecular dynamics simulations
- particulate matter
- room temperature
- tandem mass spectrometry
- health risk assessment
- high speed
- climate change
- sewage sludge