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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.
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2012 (English)In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 224, 15-20 p.Article 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, 15-20 p.
Keyword [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: diva2:564919
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Available from: 2012-11-05 Created: 2012-11-01 Last updated: 2017-12-07Bibliographically approved

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Häggström, LennartEdström, Kristina

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