Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 26: Poster session II
MM 26.27: Poster
Dienstag, 8. März 2016, 18:30–20:30, Poster B3
Doping studies and structural, magnetic, and electrochemical characterization of tetrahedral LiCo1−xMxPO4 (M = Cu, Fe, Zn, Y) — •Yuquan Wu1, Verena Neder1, Benjamin Herdeanu1, Lucas Schlestein1, Hans-Peter Meyer2, Christoph Neef1, and Rüdiger Klingeler1 — 1Kirchhoff-Institute for Physics, Heidelberg University, Heidelberg, Germany — 2Institut für Geowissenschaften, Heidelberg University, D-69120 Heidelberg, Germany
Tetrahedral LiCo1−xMxPO4 microstructures with transition metals M such as Cu, Fe, Zn, and Y are synthesized by a microwave-assisted hydrothermal method. For each dopant, the accessible doping range x is studied and the effect of doping on the crystal structure as well as on the morphology is investigated. Non-magnetic Zn-doping allows investigating the slightly diluted magnetic system LiCo1−xZnxPO4 with x 0.05, as well as paramagnetic LiCo0.05Zn0.95PO4 which enables studying well separated magnetic Co-centers. Regarding the electrochemical behavior, low doping levels enhance the intercalation kinetics while high doping levels yield a clear reduction of electrochemical capacity as demonstrated by cyclic voltammetry. In contrast to well known olivine-like LiFePO4, the iron doped tetrahedral structure shows no appreciable electrochemical activity that can be clearly associated with the Fe2+/Fe3+ redox couple.