TY - JOUR

T1 - NMR relaxometry as a versatile tool to study Li ion dynamics in potential battery materials

AU - Kuhn, A.

AU - Kunze, M.

AU - Sreeraj, P.

AU - Wiemhöfer, H. D.

AU - Thangadurai, V.

AU - Wilkening, M.

AU - Heitjans, P.

N1 - Funding Information: We thank Martin Winter and Stefano Passerini (University of Münster) for access to the PFG NMR equipment. Financial support by the Bundesministerium für Bildung und Forschung (BMBF, HE-Lion) , the Deutsche Forschungsgemeinschaft (DFG) in the frame of the research unit 1277, the Leibniz University Hannover (“Wege in die Forschung II”), and by the Studienstiftung des deutschen Volkes e.V. are gratefully acknowledged.

PY - 2012/4

Y1 - 2012/4

N2 - 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 spinlattice (as well as spinspin) 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 7Li NMR spinlattice relaxation studies focussing on Li + dynamics in crystalline ion conductors which are of relevance for battery applications, viz. Li 7 La 3Zr 2O 12 and Li 12Si 7.

AB - 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 spinlattice (as well as spinspin) 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 7Li NMR spinlattice relaxation studies focussing on Li + dynamics in crystalline ion conductors which are of relevance for battery applications, viz. Li 7 La 3Zr 2O 12 and Li 12Si 7.

KW - Battery materials

KW - Li La Zr O

KW - Li ion dynamics

KW - Li Si

KW - NMR spinlattice relaxation

UR - http://www.scopus.com/inward/record.url?scp=84858792392&partnerID=8YFLogxK

U2 - 10.1016/j.ssnmr.2012.02.001

DO - 10.1016/j.ssnmr.2012.02.001

M3 - Article

C2 - 22364761

AN - SCOPUS:84858792392

VL - 42

SP - 2

EP - 8

JO - Solid State Nuclear Magnetic Resonance

JF - Solid State Nuclear Magnetic Resonance

SN - 0926-2040

ER -