MAS NMR Study of the Metastable Solid Solution Found in the LiFePO4/FePO4 System

MAS NMR Study of the Metastable Solid Solution Found in the LiFePO4/FePO4 System

TitleMAS NMR Study of the Metastable Solid Solution Found in the LiFePO4/FePO4 System
Publication TypeJournal Article
Year of Publication2010
AuthorsJordi Cabana, Junichi Shirakawa, Guoying Chen, Thomas J Richardson, Clare P Grey
JournalChemistry of Materials
Volume22
1249
Issue3
Pagination1249-1262
Date Published02/2010
Abstract

6,7Li and 31P NMR experiments were conducted on a series of single- or two-phase samples in the LiFePO4−FePO4 system with different overall lithium contents, and containing the two end-members and/or two metastable solid solution phases, Li0.6FePO4 or Li0.34FePO4. These experiments were carried out at different temperatures in order to search for vacancy/charge ordering and ion/electron mobility in the metastable phases. Evidence for Li+−Fe2+ interactions was observed for both Li0.6FePO4 and Li0.34FePO4. The strength of this interaction leads to the formation of LiFePO4-like clusters in the latter, as shown by the room temperature data. Different motional processes are proposed to exist as the temperature is increased and various scenarios are discussed. While concerted lithium-electron hopping and/or correlations explains the data below 125 °C, evidence for some uncorrelated motion is found at higher temperatures, together with the onset of phase mixing.

DOI10.1021/cm902714v
Short TitleChem. Mater.