dc.identifier.uri |
http://dx.doi.org/10.15488/14427 |
|
dc.identifier.uri |
https://www.repo.uni-hannover.de/handle/123456789/14544 |
|
dc.contributor.author |
Gadermaier, Bernhard
|
|
dc.contributor.author |
Hogrefe, Katharina
|
|
dc.contributor.author |
Heitjans, Paul
|
|
dc.contributor.author |
Wilkening, H. Martin R.
|
|
dc.date.accessioned |
2023-07-31T12:18:14Z |
|
dc.date.available |
2023-07-31T12:18:14Z |
|
dc.date.issued |
2021 |
|
dc.identifier.citation |
Gadermaier, B.; Hogrefe, K.; Heitjans, P.; Wilkening, H.M.R.: Broadband impedance spectroscopy of Li4Ti5O12: from nearly constant loss effects to long-range ion dynamics. In: Zeitschrift für Anorganische und Allgemeine Chemie (ZAAC) - Journal of Inorganic and General Chemistry (Formerly: Zeitschrift für anorganische Chemie) 647 (2021), Nr. 22, S. 2167-2171. DOI: https://doi.org/10.1002/zaac.202100143 |
|
dc.description.abstract |
Li4Ti5O12 (LTO) is known as one of the most robust and long-lasting anode materials in lithium-ion batteries. As yet, the Li-ion transport properties of LTO are, however, not completely understood. Here, we used broadband impedance spectroscopy spanning a wide temperature range to investigate the full electrical response of LTO over a wide frequency range. It turned out that the isotherms recorded entail information about two relaxation processes. While at high temperatures the isotherms show a frequency independent plateau that corresponds to poor long-range ion transport (<10−11 S cm−1 (298 K), 0.79 eV), they reveal a second region, seen at lower temperatures and higher frequencies, which we attribute to short-range ion dynamics (10−8 S cm−1) with a significantly reduced activation energy of ca. 0.51 eV. At even lower temperatures, the isotherms are fully governed by nearly constant loss behavior, which has frequently been explained by cage-like dynamics. The present results agree with those earlier presented by 7Li NMR spin-lattice relaxation measurements being sensitive to dynamic processes taking place on quite different length scales. Our findings unveil complex Li+ ion dynamics in LTO and help understand its superior electrochemical properties. |
eng |
dc.language.iso |
eng |
|
dc.publisher |
Weinheim : Wiley-VCH |
|
dc.relation.ispartofseries |
Zeitschrift für Anorganische und Allgemeine Chemie (ZAAC) - Journal of Inorganic and General Chemistry (Formerly: Zeitschrift für anorganische Chemie) 647 (2021), Nr. 22 |
|
dc.rights |
CC BY-NC 4.0 Unported |
|
dc.rights.uri |
https://creativecommons.org/licenses/by-nc/4.0 |
|
dc.subject |
anode materials |
eng |
dc.subject |
conductivity |
eng |
dc.subject |
dielectric properties |
eng |
dc.subject |
Li diffusion |
eng |
dc.subject |
LTO |
eng |
dc.subject.ddc |
540 | Chemie
|
|
dc.title |
Broadband impedance spectroscopy of Li4Ti5O12: from nearly constant loss effects to long-range ion dynamics |
eng |
dc.type |
Article |
|
dc.type |
Text |
|
dc.relation.essn |
1521-3749 |
|
dc.relation.issn |
0044-2313 |
|
dc.relation.doi |
https://doi.org/10.1002/zaac.202100143 |
|
dc.bibliographicCitation.issue |
22 |
|
dc.bibliographicCitation.volume |
647 |
|
dc.bibliographicCitation.firstPage |
2167 |
|
dc.bibliographicCitation.lastPage |
2171 |
|
dc.description.version |
publishedVersion |
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tib.accessRights |
frei zug�nglich |
|