title: NMR relaxometry as a versatile tool to study Li ion dynamics in potential battery materials.
abstract: NMR spin relaxometry is known to be a powerful tool for the investigation of Li(+) dynamics in (non-paramagnetic) 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 (7)Li NMR spin-lattice relaxation studies focussing on Li(+) dynamics in crystalline ion conductors which are of relevance for battery applications, viz. Li(7) La(3)Zr(2)O(12) and Li(12)Si(7).
authors.affiliation: Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3-3a, 30167 Hannover, Germany. kuhn@pci.uni-hannover.de
authors.forename: A
authors.initials: A
authors.lastname: Kuhn
authors.forename: M
authors.initials: M
authors.lastname: Kunze
authors.forename: P
authors.initials: P
authors.lastname: Sreeraj
authors.forename: H D
authors.initials: HD
authors.lastname: Wiemhöfer
authors.forename: V
authors.initials: V
authors.lastname: Thangadurai
authors.forename: M
authors.initials: M
authors.lastname: Wilkening
authors.forename: P
authors.initials: P
authors.lastname: Heitjans
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D004735:Energy Transfer; D007477:Ions; D008094:Lithium / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008422:Materials Testing / Q000379:methods*
chemical_list: D007477:Ions; D008094:Lithium