Berlin 2012 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 30: Functional Materials III

MM 30.4: Vortrag

Mittwoch, 28. März 2012, 11:00–11:15, H 0106

Combined Nuclear Magnetic Resonance and x-ray diffraction study on single crystalline LiMnPO4 — •Christian Rudisch, Sven Partzsch, Jochen Geck, Hans-Joachim Grafe, and Bernd Büchner — IFW Dresden

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 as well as the effect of disorder on the mobility in this material is not well understood. The advantage of the use of single crystals is that the NMR 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 interstitial 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. We present results of a combined NMR and X-ray diffraction study which indicate a substantial degree of disorder in LiMnPO4, where the Li ions are distributed along the b- and c-axis of the crystal. The type of disorder underlines theoretical calculations which claim a possible Li-mobility in b direction. The impact of disorder on the Li mobility will be discussed.