title: The use of 6Li{7Li}-REDOR NMR spectroscopy to compare the ionic conductivities of solid-state lithium ion electrolytes.
abstract: Garnet-like solid-state electrolyte materials for lithium ion batteries are promising replacements for the currently-used liquid electrolytes. This work compares the temperature dependent Li(+) ion hopping rate in Li6BaLa2M2O12 (M = Ta, Nb) using solid-state (6)Li{(7)Li}-REDOR NMR. The slope of the (6)Li{(7)Li}-REDOR curve is highly temperature dependent in these two phases, and a comparison of the changes of the REDOR slopes as a function of temperature has been used to evaluate the Li(+) ion dynamics. Our results indicate that the Nb phase has a higher overall ionic conductivity in the range of 247 K to 350 K, as well as a higher activation energy for lithium ion hopping than the Ta counterpart. For appropriate relative timescales of the dipolar couplings and ion transport processes, this is shown to be a facile method to compare ion dynamics among similar structures.
authors.affiliation: McMaster University, Department of Chemistry and Chemical Biology, 1280 Main St. West, Hamilton, Ontario, Canada, L8S 1H2. goward@mcmaster.ca.
authors.forename: T L
authors.initials: TL
authors.lastname: Spencer
authors.forename: N W
authors.initials: NW
authors.lastname: Plagos
authors.forename: D H
authors.initials: DH
authors.lastname: Brouwer
authors.forename: G R
authors.initials: GR
authors.lastname: Goward