Gond, Ritambhara and Meena, Sher Singh and Yusuf, SM and Shukla, Vivekanand and Jena, Naresh K and Ahuja, Rajeev and Okada, Shigeto and Barpanda, Prabeer (2017) Enabling the Electrochemical Activity in Sodium Iron Metaphosphate [NaFe(PO3)3] Sodium Battery Insertion Material: Structural and Electrochemical Insights. In: Inorganic Chemistry, 56 (10). pp. 5918-5929. ISSN 0020-1669
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Abstract
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.
Item Type: | Journal Article |
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Publication: | Inorganic Chemistry |
Publisher: | American Chemical Society |
Additional Information: | The Copyright of this article belongs to the American Chemical Society |
Department/Centre: | Division of Chemical Sciences > Materials Research Centre |
Date Deposited: | 07 Jun 2022 10:22 |
Last Modified: | 07 Jun 2022 10:22 |
URI: | https://eprints.iisc.ac.in/id/eprint/72931 |
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