Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 5: Functional Materials - Battery Materials I

MM 5.3: Vortrag

Montag, 11. März 2013, 10:45–11:00, H26

Morphology and size control of LiMnPO4 nano- and microcrystals — •Christoph Neef¹, Carsten Jähne¹, Hans-Peter Meyer², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, University of Heidelberg, D-69120 Heidelberg, Germany — ²Institut für Geowissenschaften, University of Heidelberg, D-69120 Heidelberg, Germany

A microwave-assisted hydrothermal synthesis route was applied to grow LiMnPO4 micro- and nanocrystals, starting from acetate precursors. The crystal size can be manipulated over a range of two orders of magnitude (from around 10 um down to a few 100 nm) by appropriate adjustment of both synthesis conditions: the precursor concentration and the pH-value of the reactant. The resulting crystal morphology as well as the materials texture and agglomeration tendency were investigated by means of XRD and SEM. The influence of morphology, size, and agglomeration on the electrochemical properties were investigated by cyclic voltammetry. Reversible electrochemical activity appears at particle size below 1 um.