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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session

MM 18.9: Poster

Montag, 31. März 2014, 18:00–20:00, P4

A new additive-assisted synthesis route and electrochemical properties of olivine LiCoPO4 — •Christoph Neef¹, Hans-Peter Meyer², and Rüdiger Klingeler¹ — ¹Kirchhoff Institut für Physik, Universität Heidelberg, D-69120 Heidelberg — ²Institut für Geowissenschaften, Universität Heidelberg, D-69120 Heidelberg

Olivine LiCoPO4 micro- and nanocrystals were synthesized applying a two-step process starting by hydrothermal growth of non-olivine LiCoPO4-tetra which then is transformed to the olivine phase at high temperatures. By adding various organic additives such as sugars, acids, organic solvents, and ammonia compounds in step 1, the shape, size, and tendency to agglomeration of the obtained particles is investigated. This yields a variety in particle morphologies. Galvanostatic cycling and impedance spectroscopy show strong differences in the electrochemical performance of the different materials. In particular, the rate capability strongly depends on the morphology as well as aging effects due to electrolyte decomposition, the latter being typical for high voltage materials like LiCoPO4.