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MM: Fachverband Metall- und Materialphysik

MM 32: Functional Materials IV

MM 32.3: Vortrag

Mittwoch, 28. März 2012, 12:00–12:15, H 0106

Synthesis of metastable transition metal compounds for electrochemical energystorage — •Carsten Jähne¹, Christoph Neef¹, Hans-Peter Meyer², and Rüdiger Klingeler¹ — ¹Kirchhoff-Institut für Physik, Universität Heidelberg, INF 227, 69120 Heidelberg — ²Institut für Geowissenschaften, Universität Heidelberg, INF 236, 69120 Heidelberg

Advanced cathode materials for Lithium-Ion batteries are currently under intense research. We apply microwave-assisted hydrothermal reactions which enable synthesizing materials with a huge variety of morphologies and with grains down to the nanoscale. Here we report on the synthesis of two metastable materials LT-LiCoO₂ and non-olivine LiCoPO₄. We note that the latter exhibits a theoretically predicted crystal structure not observed yet in experiment. Crystal structure, morphology and Co-valancies were determined by means of XRD, SEM and magnetisation studies, respectively. The thermal stability of LiCoPO₄ was investigated with DSC/TGA. The electrochemical behaviour of both materials was analyzed by cyclic voltammetry (CV) and charge-discharge-cycling (GITT).