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dc.contributor.authorBrownrigg, A.W.
dc.contributor.authorMountjoy, G.
dc.contributor.authorChadwick, A.V.
dc.contributor.authorAlfredsson, M.
dc.contributor.authorBras, W.
dc.contributor.authorBillaud, J.
dc.contributor.authorArmstrong, A.R.
dc.contributor.authorBruce, P.G.
dc.contributor.authorDominko, R.
dc.contributor.authorKelder, E.M.
dc.identifier.citationBrownrigg , A W , Mountjoy , G , Chadwick , A V , Alfredsson , M , Bras , W , Billaud , J , Armstrong , A R , Bruce , P G , Dominko , R & Kelder , E M 2015 , ' In situ Fe K-edge X-ray absorption spectroscopy study during cycling of Li 2 FeSiO 4 and Li 2.2 Fe 0.9 SiO 4 Li ion battery materials ' , Journal of Materials Chemistry A , vol. 3 , no. 14 , pp. 7314-7322 .
dc.identifier.otherPURE: 179932255
dc.identifier.otherPURE UUID: eb5a178e-8508-4d5d-9d26-bdc65df0268e
dc.identifier.otherScopus: 84925609607
dc.identifier.otherORCID: /0000-0003-1937-0936/work/28123631
dc.identifier.otherWOS: 000351845400016
dc.description.abstractIn situ X-ray Absorption Spectroscopy (XAS) results are presented for Li2FeSiO4 and Li2.2Fe0.9SiO4, promising cathode materials for lithium-ion batteries. The aims are to establish the valence and local structure of Fe during charge and discharge to understand if the Fe3+/Fe4+ redox pair can be reached in the current battery design. It is found that the valence state changes between Fe2+ and Fe3+, with no evidence of Fe4+ before the onset of electrolyte degradation. There is a reversible contraction and extension of the Fe–O bond lengths during cycling while the Fe–Si distance remains constant, which underlines the stability of the Li2FeSiO4 material. The same observations apply to Li2.2Fe0.9SiO4 cathode material indicating that changing the stoichiometry does not provide any additional structural stability
dc.relation.ispartofJournal of Materials Chemistry Aen
dc.rightsCopyright 2015 the Authors. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at:
dc.subjectQD Chemistryen
dc.subjectSDG 7 - Affordable and Clean Energyen
dc.titleIn situ Fe K-edge X-ray absorption spectroscopy study during cycling of Li2FeSiO4 and Li2.2Fe0.9SiO4 Li ion battery materialsen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews. School of Chemistryen
dc.description.statusPeer revieweden

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