From micro to macro

Access to long-range Li⁺ diffusion parameters in solids via microscopic ^{6, 7}Li spin-alignment echo NMR spectroscopy

authored by

Martin Wilkening, Paul Heitjans

Abstract

The development of highly conductive solids is a rapidly growing research area in materials science. In particular, the study of Li-ion conductors is driven by the ambitious effort to design powerful lithium-ion batteries. A deeper understanding of Li dynamics in solids requires the availability of a large set of complementary techniques to probe Li self-diffusion on different length and time-scales. We report on ⁷Li as well as ⁶Li spin-alignment echo (SAE) nuclear magnetic resonance (NMR) spectroscopy, which is capable of probing long-range diffusion parameters from a microscopic, that is, atomic-scale, point of view. So far, variable-temperature SAE NMR spectroscopy has been applied to a number of polycrystalline and glassy Li-ion conductors. The materials investigated serve as model systems to unravel the interesting features of the technique in determining reliable Li jump rates and hopping activation energies. In particular, the latter are compared with those probed by macroscopic techniques such as dc-conductivity measurements that are sensitive to long-range translational motions. Jumping lithium ions: Spin-alignment echo (SAE) NMR can be used to trace slow diffusion processes in solids (see picture). The results are comparable with those probed by macroscopic methods, making the technique an attractive tool to study lithium-ion conductors.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry
Center for Solid State Chemistry and New Materials (ZFM)

Type

Review article

Journal

CHEMPHYSCHEM

Volume

13

Pages

53-65

No. of pages

13

ISSN

1439-4235

Publication date

16.01.2012

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics, Physical and Theoretical Chemistry

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1002/cphc.201100580 (Access: Unknown)