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Role of iron in Na1.5Fe0.5Ti1.5(PO4)(3)/C as electrode material for Na-ion batteries studied by operando Mossbauer spectroscopy
Univ Montpellier, CNRS, Inst Charles Gerhardt, UMR 5253, Pl Eugene Bataillon, F-34095 Montpellier 5, France.;Univ Cadi Ayyad, Lab Chim Mat & Environm, Ave A Khattabi,BP 549, Marrakech, Morocco..
Univ Cadi Ayyad, Lab Chim Mat & Environm, Ave A Khattabi,BP 549, Marrakech, Morocco.;Univ Mohammed VI Polytech, Ctr Adv Mat, Lot 660, Hay Moulay Rachid, Ben Guerir, Morocco..
Univ Montpellier, CNRS, Inst Charles Gerhardt, UMR 5253, Pl Eugene Bataillon, F-34095 Montpellier 5, France.;CNRS, Reseau Stockage Electrochim Energie, FR 3459, F-80039 Amiens, France..
Univ Cadi Ayyad, Lab Chim Mat & Environm, Ave A Khattabi,BP 549, Marrakech, Morocco..
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2016 (English)In: Hyperfine Interactions, 2016, 61Conference paper (Refereed)Text
Abstract [en]

The role of iron in Na1.5Fe0.5Ti1.5(PO4)(3)/C electrode material for Na batteries has been studied by Fe-57 Mossbauer spectroscopy in operando mode. The potential profile obtained in the galvanostatic regime shows three plateaus at different voltages due to different reaction mechanisms. Two of them, at 2.2 and 0.3 V vs Na+/Na-0, have been associated to redox processes involving iron and titanium in Na1.5Fe0.5Ti1.5(PO4)(3). The role of titanium was previously elucidated for NaTi2(PO4)(3) and the effect of the substitution of Fe for Ti was investigated with 57Fe Mossbauer spectroscopy. We show that iron is an electrochemically active center at 2.2 V with the reversible Fe3+/Fe2+ transformation and then remains at the oxidation state Fe2+ along the sodiation until the end of discharge at 0 V.

Place, publisher, year, edition, pages
2016. 61
Keyword [en]
Electrode, NASICON, Phosphate, Na-ion batteries, Mossbauer spectroscopy, in situ
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:uu:diva-301463DOI: 10.1007/s10751-016-1292-7ISI: 000372730500002OAI: oai:DiVA.org:uu-301463DiVA: diva2:954768
Conference
International Conference on the Applications of the Mossbauer Effect (ICAME), SEP 13-18, 2015, Hamburg, GERMANY
Available from: 2016-08-23 Created: 2016-08-23 Last updated: 2016-08-23Bibliographically approved

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Edström, Kristina
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