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Origin of the irreversible capacity of the Fe0.5TiOPO4 anode material
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
LCME, University Cadi Ayyad, Marrakech, Morocco.ORCID iD: 0000-0003-1322-361X
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2012 (English)In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 224, p. 15-20Article in journal (Refereed) Published
Abstract [en]

Fe0.5TiOPO4 oxyphosphate was prepared directly by solid state reaction. It crystallizes in the monoclinic system with P2(1)/c space group and the use of Fe0.5TiOPO4 as an active material in lithium-ion batteries shows two potential plateaus and an irreversible discharge capacity of similar to 200 rnAh/g. To understand the origin of this irreversibility, a series of LixFe0.5TiOPO4 (x = 0.06, 0.21 0.76, 1.14) were chemically prepared and analyzed by X-ray diffraction. A structure amorphization of the LixFe0.5TiOPO4 phosphates takes place during the lithiation process. Magnetization and Mossbauer spectroscopy studies of the LixFe0.5TiOPO4 samples clearly show the formation of iron metal which induces a deterioration of the crystal structure of the studied electrode materials. The lithiation process leads thus to a conversion reaction which explains the irreversibility of the electrochemical process during the first discharge. (C) 2012 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
2012. Vol. 224, p. 15-20
Keywords [en]
Lithium batteries, Fe0.5TiOPO4, Anode material, Conversion reaction
National Category
Natural Sciences Inorganic Chemistry
Research subject
Chemistry with specialization in Inorganic Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-183754DOI: 10.1016/j.ssi.2012.07.006ISI: 000309086000003OAI: oai:DiVA.org:uu-183754DiVA, id: diva2:564919
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StandUpAvailable from: 2012-11-05 Created: 2012-11-01 Last updated: 2017-12-30

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Häggström, LennartEdström, Kristina

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