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Enabling the Electrochemical Activity in Sodium Iron Metaphosphate [NaFe(PO3)(3)] Sodium Battery Insertion Material: Structural and Electrochemical Insights
Indian Inst Sci, Bangalore .
Bhabha Atom Res Ctr, Bombay .
Bhabha Atom Res Ctr, Bombay .
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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2017 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 56, no 10, 5918-5929 p.Article in journal (Refereed) Published
Abstract [en]

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 Mossbauer spectroscopy. Synergizing experimental and computational tools, NaFe(PO3)(3) metaphosphate is presented as an electrochemically active sodium insertion host material.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2017. Vol. 56, no 10, 5918-5929 p.
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Inorganic Chemistry
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URN: urn:nbn:se:uu:diva-327152DOI: 10.1021/acs.inorgchem.7b00561ISI: 000401593800049PubMedID: 28462996OAI: oai:DiVA.org:uu-327152DiVA: diva2:1136075
Funder
Carl Tryggers foundation Swedish Research CouncilSwedish Energy Agency
Available from: 2017-08-25 Created: 2017-08-25 Last updated: 2017-08-25Bibliographically approved

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Shukla, VivekanandJena, Naresh K.Ahuja, Rajeev

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