Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 22: Poster session I

MM 22.3: Poster

Montag, 20. März 2017, 19:00–20:00, P4

Electrochemical properties of hierarchically structured C-coated LiFe_xMn_1−xPO₄ — •Enzo Moretti¹, Christoph Neef¹, Elisa Thauer¹, and Rüdiger Klingeler^1,2 — ¹Kirchhoff Institut für Physik, Universität Heidelberg — ²Centre for Advanced Materials, Universität Heidelberg

High-purity LiFe_xMn_1−xPO₄ with various doping levels x = 0.1 - 0.5, different carbon contents, and variable primary particles size have been synthesized by a combination of solid-state synthesis, optical floating zone treatment, and ball milling. The obtained nanosized materials were assembled to larger, i.e. micrometer-sized, hierarchically structured entities by thermal treatment and usage of different organic additives. Applicability of the resulting hierarchically structured product for cathodes in lithium-ion batteries is investigated by means of cyclic voltammetry and galvanostatic cycling. The effect of both the primary and secondary particle size and the carbon ratio is studied in particular. In parallel, the obtained doping series is used to study the evolution of antiferromagnetic order at low temperature as well as the average magnetic moment per metal ion, i.e. the mean electron configuration.