Regensburg 2010 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 58: Topical Session Battery Materials IV
MM 58.5: Talk
Thursday, March 25, 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 [010] 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.
[1] Krutik, V. M. et al. Sov. Phys. Crystallogr., 24, 425–429, 1979.
[2] Moore, P. B. et al. Am. Mineral., 66, 1034–1049, 1981.
[3] Cámara, F. et al. Am. Mineral., 91, 1249–1259, 2006.