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Detecting unalloyed tin in LiSn2(PO4)3-based anodes with Mössbauer spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics.
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2009 (English)In: Journal of Solid State Electrochemistry, ISSN 1432-8488, E-ISSN 1433-0768, Vol. 13, no 8, 1267-1272 p.Article in journal (Refereed) Published
Abstract [en]

The first discharge of the Li+ ion anode material LiSn2(PO4)3 was investigated with Mössbauer spectroscopy and electrochemical techniques. Mössbauer spectroscopy provided insight into the structure of the tin atoms of the fully discharged anode materials. Spectra consist of overlapping peaks, which are assigned to noncrystalline β-Sn and Li–Sn alloy domains. An analysis of the relative intensities of the Mössbauer spectra shows the relative abundance of β-Sn increases at the expense of the Li–Sn alloy as the discharge rate increases. Cell polarization occurs at higher discharge rates, leading to inefficient electrode utilization and poor cycling performance. Sluggish Li+ ion diffusion through the amorphous Li3PO4 network that is formed early in the discharge process might be responsible for the poor electrochemical performance and the accumulation of unalloyed tin.

Place, publisher, year, edition, pages
2009. Vol. 13, no 8, 1267-1272 p.
Keyword [en]
Lithium ion batteries, Anodes, LiSn2(PO4)3, Mössbauer spectroscopy
National Category
Chemical Sciences
Research subject
Inorganic Chemistry
URN: urn:nbn:se:uu:diva-108868DOI: 10.1007/s10008-008-0661-9ISI: 000266483300015OAI: oai:DiVA.org:uu-108868DiVA: diva2:241199
Department of Materials Chemistry, Uppsala University, P.O. Box 538, 751 21 Uppsala, SwedenAvailable from: 2009-10-01 Created: 2009-10-01 Last updated: 2010-07-26Bibliographically approved

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