期刊
SOLID STATE NUCLEAR MAGNETIC RESONANCE
卷 42, 期 -, 页码 2-8出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ssnmr.2012.02.001
关键词
Li ion dynamics; NMR spin-lattice relaxation; Battery materials; Li7La3Zr2O12; Li12Si7
资金
- Bundesministerium fur Bildung und Forschung (BMBF, HE-Lion)
- Deutsche Forschungsgemeinschaft (DFG) [1277]
- Leibniz University Hannover (Wege in die Forschung II)
- Studienstiftung des deutschen Volkes e.V
NMR spin relaxometry is known to be a powerful tool for the investigation of Li+ dynamics in (nonparamagnetic) crystalline and amorphous solids. As long as significant structural changes are absent in a relatively wide temperature range, with NMR spin-lattice (as well as spin-spin) relaxation measurements information on Li self-diffusion parameters such as jump rates and activation energies are accessible. Diffusion-induced NMR relaxation rates are governed by a motional correlation function describing the ion dynamics present. Besides the mean correlation rate of the dynamic process, the motional correlation function (i) reflects deviations from random motion (so-called correlation effects) and (ii) gives insights into the dimensionality of the hopping process. In favorable cases, i.e., when temperature- and frequency-dependent NMR relaxation rates are available over a large dynamic range, NMR spin relaxometry is able to provide a comprehensive picture of the relevant Li dynamic processes. In the present contribution, we exemplarily present two recent variable-temperature Li-7 NMR spin-lattice relaxation studies focussing on Li+ dynamics in crystalline ion conductors which are of relevance for battery applications, viz. Li-7 La3Zr2O12 and Li12Si7. (C) 2012 Elsevier Inc. All rights reserved.
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