Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 11018-11021 |
| Seitenumfang | 4 |
| Fachzeitschrift | Journal of the American Chemical Society |
| Jahrgang | 133 |
| Ausgabenummer | 29 |
| Publikationsstatus | Veröffentlicht - 27 Juli 2011 |
Abstract
The intermetallic compounds LixSiy have attracted considerable interest because of their potential use as anode materials in Li ion batteries. In addition, the crystalline phases in the Li - Si phase diagram turn out to be outstanding model systems for the measurement of fast Li ion diffusion in solids with complex structures. In the present work, the Li self-diffusivity in crystalline Li12Si7 was thoroughly probed by 7Li NMR spin - lattice relaxation (SLR) measurements. Variable-temperature and -frequency NMR measurements performed in both the laboratory and rotating frames of reference revealed three distinct diffusion processes in Li12Si7. The diffusion process characterized by the highest Li diffusivity seems to be confined to one dimension. It is one of the fastest motions of Li ions in a solid at low temperatures reported to date. The Li jump rates of this hopping process followed Arrhenius behavior; the jump rate was 105 s- 1 at 150 K and reached 10 9 s- 1 at 425 K, indicating an activation energy as low as 0.18 eV.
ASJC Scopus Sachgebiete
- Chemische Verfahrenstechnik (insg.)
- Katalyse
- Chemie (insg.)
- Allgemeine Chemie
- Biochemie, Genetik und Molekularbiologie (insg.)
- Biochemie
- Chemische Verfahrenstechnik (insg.)
- Kolloid- und Oberflächenchemie
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in: Journal of the American Chemical Society, Jahrgang 133, Nr. 29, 27.07.2011, S. 11018-11021.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Li ion diffusion in the anode material Li12Si7
T2 - Ultrafast quasi-1D diffusion and two distinct fast 3D jump processes separately revealed by 7Li NMR relaxometry
AU - Kuhn, Alexander
AU - Sreeraj, Puravankara
AU - Pöttgen, Rainer
AU - Wiemhöfer, Hans Dieter
AU - Wilkening, Martin
AU - Heitjans, Paul
PY - 2011/7/27
Y1 - 2011/7/27
N2 - The intermetallic compounds LixSiy have attracted considerable interest because of their potential use as anode materials in Li ion batteries. In addition, the crystalline phases in the Li - Si phase diagram turn out to be outstanding model systems for the measurement of fast Li ion diffusion in solids with complex structures. In the present work, the Li self-diffusivity in crystalline Li12Si7 was thoroughly probed by 7Li NMR spin - lattice relaxation (SLR) measurements. Variable-temperature and -frequency NMR measurements performed in both the laboratory and rotating frames of reference revealed three distinct diffusion processes in Li12Si7. The diffusion process characterized by the highest Li diffusivity seems to be confined to one dimension. It is one of the fastest motions of Li ions in a solid at low temperatures reported to date. The Li jump rates of this hopping process followed Arrhenius behavior; the jump rate was 105 s- 1 at 150 K and reached 10 9 s- 1 at 425 K, indicating an activation energy as low as 0.18 eV.
AB - The intermetallic compounds LixSiy have attracted considerable interest because of their potential use as anode materials in Li ion batteries. In addition, the crystalline phases in the Li - Si phase diagram turn out to be outstanding model systems for the measurement of fast Li ion diffusion in solids with complex structures. In the present work, the Li self-diffusivity in crystalline Li12Si7 was thoroughly probed by 7Li NMR spin - lattice relaxation (SLR) measurements. Variable-temperature and -frequency NMR measurements performed in both the laboratory and rotating frames of reference revealed three distinct diffusion processes in Li12Si7. The diffusion process characterized by the highest Li diffusivity seems to be confined to one dimension. It is one of the fastest motions of Li ions in a solid at low temperatures reported to date. The Li jump rates of this hopping process followed Arrhenius behavior; the jump rate was 105 s- 1 at 150 K and reached 10 9 s- 1 at 425 K, indicating an activation energy as low as 0.18 eV.
UR - http://www.scopus.com/inward/record.url?scp=79960602280&partnerID=8YFLogxK
U2 - 10.1021/ja2020108
DO - 10.1021/ja2020108
M3 - Article
AN - SCOPUS:79960602280
VL - 133
SP - 11018
EP - 11021
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
SN - 0002-7863
IS - 29
ER -