Study of Lithium Dynamics in Monoclinic Li3Fe2(PO4)3 using 6Li VT and 2D Exchange MAS NMR Spectroscopy

Details of Li-mobility in Li3Fe2(PO4)3 are elucidated using solid-state 6Li NMR. Three crystallographically unique Li sites were resolved under magic angle spinning (25 kHz) with paramagnetic shifts arising at 45 ppm, 102 ppm, and 216 ppm. These resonances were assigned to the crystallographic positions based on the degree of the Fermi-contact interaction with the paramagnetic iron center. 6Li 2D exchange NMR experiments were performed under …