Complex Plane and 7Li NMR Studies of Highly Conductive Sulfide‐Based Lithium Glasses

Abstract

The activation energy for lithium diffusion in highly conductive glasses with varying lithium concentrations is measured by 7Li NMR linewidth techniques, and is compared to activation energies for ionic conductivity obtained by complex plane techniques. The 7Li NMR spectra for the glasses have been examined as a function of temperature; the HB equation for motional narrowing was used to calculate the activation energies for lithium movement in the various glasses. From the NMR data, two activation energies were observed over the temperature range of −100°C to room temperature. The low temperature, high activation energy values correlate well with the activation energies obtained from ionic conductivity measurements, while the high temperature, low activation energy process is apparently due to some sort of short‐range motion detected only by the 7Li NMR measurements.