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Detecting unalloyed tin in LiSn2(PO4)3-based anodes with Mössbauer spectroscopy
- Burba, Christopher M. (author)
- Frech, Roger (author)
-
- Seidel, Agneta (author)
- Uppsala universitet,Institutionen för fysik och astronomi
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- (creator_code:org_t)
- 2008-09-17
- 2009
- English.
- In: Journal of Solid State Electrochemistry. - : Springer Science and Business Media LLC. - 1432-8488 .- 1433-0768. ; 13:8, s. 1267-1272
- Journal article (peer-reviewed)
Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Lithium ion batteries
- Anodes
- LiSn2(PO4)3
- Mössbauer spectroscopy
- Chemistry
- Kemi
- Inorganic Chemistry
- Oorganisk kemi
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- ref (subject category)
- art (subject category)
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