PMID: 11328163May 1, 2001Paper

Lithium dynamics in LiMn2O4 probed directly by two-dimensional (7)Li NMR

Physical Review Letters
V W VerhoevenF M Mulder

Abstract

LiMn2O4 has been studied using magic-angle-spinning nuclear magnetic resonance (MAS NMR). 1D MAS NMR shows three Li resonances assigned to different crystallographic sites. At low temperatures an extra peak appears, indicating charge ordering of Mn3+ and Mn4+. Direct observation of the lithium dynamics was possible using rotor-synchronized 2D exchange NMR. A millisecond time scale exchange of lithium starts around 285 K between the 8a and the 16c site. At 380 K lithium even starts to hop between more than two sites. The activation energies and Li jump rates are derived and are in agreement with those determined macroscopically.

References


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Citations

May 16, 2012·Accounts of Chemical Research·Anton Van der VenAnna A Belak
Mar 26, 2008·The Journal of Chemical Physics·Burkhard GeilRoland Böhmer
Sep 29, 2011·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Martin Wilkening, Paul Heitjans
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