Li ion dynamics in a LiAlO ₂ single crystal studied by ⁷Li NMR spectroscopy and conductivity measurements

authored by

Sylvio Indris, Paul Heitjans, Reinhard Uecker, Bernhard Roling

Abstract

Dynamics of lithium ions in solid materials is a key parameter for applications such as electrode materials for lithium ion batteries. The Li diffusion in single crystalline γ-LiAlO ₂ was studied with temperature-dependent ⁷Li NMR spectroscopy and conductivity measurements. The NMR measurements include a detailed study of the temperature dependence of static spectra and spin-lattice relaxation rate measurements. A combination of these methods allowed us to study diffusion coefficients over a range of more than seven decades. The range covered was 10 ^-20 to 10 ^-13 m ² s ^-1 corresponding to jump rates between 10 ⁰ and 10 ⁷ s ^-1. An activation energy of about 1 eV was found. The hopping between crystallographically equivalent Li sites was explicitly verified by coalescence of quadrupole satellites in the NMR spectra.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry

External Organisation(s)

Karlsruhe Institute of Technology (KIT)
Leibniz Institute for Crystal Growth (IKZ)
Philipps-Universität Marburg

Type

Article

Journal

Journal of Physical Chemistry C

Volume

116

Pages

14243-14247

No. of pages

5

ISSN

1932-7447

Publication date

12.07.2012

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials, General Energy, Physical and Theoretical Chemistry, Surfaces, Coatings and Films

Sustainable Development Goals

SDG 7 - Affordable and Clean Energy

Electronic version(s)

https://doi.org/10.1021/jp3042928 (Access: Unknown)