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Excess lithium in t...
Excess lithium in transition metal layers of epitaxially grown thin film cathodes of Li2MnO3 leads to rapid loss of covalency during first battery cycle
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- Massel, Felix (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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Hikima, Kazuhiro (author)
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- Rensmo, Håkan (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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Suzuki, Kota (author)
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Hirayama, Masaaki (author)
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- Xu, Chao, 1988- (author)
- Uppsala universitet,Strukturkemi,Univ Cambridge, Dept Chem, Lensfield Rd, Cambridge CB2 1EW, England
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- Younesi, Reza (author)
- Uppsala universitet,Strukturkemi
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Liu, Yi-Sheng (author)
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Guo, Jinghua (author)
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Kanno, Ryoji (author)
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- Hahlin, Maria (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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- Duda, Laurent (author)
- Uppsala universitet,Molekyl- och kondenserade materiens fysik
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(creator_code:org_t)
- 2019-11-04
- 2019
- English.
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In: The Journal of Physical Chemistry C. - : American Chemical Society (ACS). - 1932-7447 .- 1932-7455. ; 123:47, s. 28519-28526
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We have investigated the initial-cycle battery behavior of epitaxial thin films of Li2MnO3-cathodes by employing resonant inelastic X-ray scattering (RIXS) at the O K- and Mn L3-edges. Thin films (25 nm thickness) with Li/Mn-ratios of 2.06 (stoichiometric) and 2.27 (over-stoichiometric), respectively, were epitaxially grown by pulsed laser deposition and electrochemically cycled as battery cathodes in half-cell setup, stopped at potentials for full charge (delithiation) and complete discharge (relithiation), respectively, for X-ray analysis. Using RIXS, we find that significant anionic reactions take place in both materials upon initial delithiation. However, no signatures of localized oxygen holes are found in O K-RIXS of the Li2MnO3 regardless of Li/Mn-ratio. Instead, the top of the oxygen valence band is depleted of electrons forming delocalized empty states upon delithiation. Mn L-RIXS of the over-stoichiometric cathode material shows a progressive loss of charge transfer state intensity during the first battery cycle, revealing a more rapid loss of Mn--O covalency in the over-stoichiometric material.
Subject headings
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- Li-ion battery
- Li-rich lithium manganese oxide cathode
- pulsed laser deposition (PLD)
- thin film
- resonant inelastic X-ray scattering (RIXS)
- soft X-ray absorption spectroscopy (XAS)
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Massel, Felix
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Hikima, Kazuhiro
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Rensmo, Håkan
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Suzuki, Kota
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Hirayama, Masaak ...
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Xu, Chao, 1988-
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show more...
-
Younesi, Reza
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Liu, Yi-Sheng
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Guo, Jinghua
-
Kanno, Ryoji
-
Hahlin, Maria
-
Duda, Laurent
-
show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Materials Chemis ...
- Articles in the publication
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The Journal of P ...
- By the university
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Uppsala University