Dresden 2011 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 44: Functional Materials II

MM 44.6: Vortrag

Freitag, 18. März 2011, 11:45–12:00, IFW A

Nuclear Magnetic Resonance study of LiMnPO₄ with different Li concentrations — •Christian Schmidt, Hans-Joachim Grafe, Nadja Wizent, Lothar Dunsch, and Bernd Büchner — Leibniz-Institut für Festkörper- und Werkstoffforschung, Dresden, Germany

LiMnPO₄ is a promising material for building the cathode of Li-ion batteries due to its high stability and large cation mobility. Yet, the mobility of the Li-ions in this material is not well understood. Here, we present ⁷Li and ³¹P Nuclear Magnetic Resonance (NMR) measurements on Li_xMnPO₄ single crystals for different doping levels (x=0.6, x=0.8, and x=1). NMR is a powerful tool to investigate the microscopic ionic jump processes rather than the macroscopic material transport. The nuclear spin lattice relaxation rate, 1/T₁, and the linewidth, σ, of the resonance lines show characteristic temperature dependencies related to the ionic jump processes that set in at a certain energy or temperature, respectively. The advantage of the use of single crystals is that the linewidth is not broadened by a distribution of linewidths as in a powder sample, but can show a fine structure that could be related to different sites in the crystal. Furthermore, single crystals allow for an orientation dependent investigation of the Li-ion mobility, where certain crystal orientations are preferred by the Li-cations.