Regensburg 2010 – wissenschaftliches Programm
MM 58.5: Vortrag
Donnerstag, 25. März 2010, 17:15–17:30, H6
The ortho–phosphate arrojadite as new material for cathodes in Lithium–ion batteries. — •Christoph Kallfaß1, Constantin Hoch1, Hermann Schier1, and Helmut Schubert2 — 1Max-Planck-Institut für Festkörperforschung, Heisernbergstr. 1, D-70569 Stuttgart, — 2Technische Universität Berlin, Institut für Werkstoffwissenschaften, Englische Str. 20, D-10587 Berlin
The investigation of the crystal structure of the iron- and manganese containing ortho–phosphate mineral arrojadite was extending over several years [1-3]. Single crystal diffraction using X–ray and neutron radiation combined with complete determination of all chemical constituents of the component result in a new structural model. The new model describes two different types of channels running along  and elucidates the occupancy of the atomic positions inside these channels. A novel chemical process offers the opportunity to modifiy the the elementar arrangement of the atomic positions inside the channels using methods of so–called “green chemistry”. When using Li+ cations in this process a new material for cathodes can be made out of the mineral arrojadite. A lithium–ion battery made of an arrojadite cathode worked for more than 15.000 cycles (2.0 ≤ V ≤ 4.5) with minor loss in capacity. The novel chemical process and particularly the enrichement of Li+ cations was verified by single crystal diffraction using neutron radiation and 6Li–MAS–NMR–spectroscopy.
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