Regensburg 2010 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 26: Poster Session
MM 26.60: Poster
Dienstag, 23. März 2010, 14:45–16:30, Poster C
Magnesium secondary batteries based on V2O5 cathodes — •Wiebke Lohstroh, Philipp Leufke, and Horst Hahn — Institute of Nanotechnology, Karlsruhe Institute of Technology, Postfach 3640, 76021 Karlsuhe, Germany
The development of high performance, reliable energy storage systems is a mandatory prerequisite if the use of fossil fuels shall be curtailed in mobile and stationary applications. Important parameters for any energy storage system are energy and power density as well as reliability, cycle life, safety and cost. Lithium ion secondary batteries are thought to be able to meet these demands and research activities have been intensified in recent years. An alternative pathway, which has only been explored little so far, is a secondary battery based on polyvalent ions,e.g. the Mg/Mg2+ redox couple. Mg is abundant and it is thought to be intrinsically safer than the Li analogue thus Mg based batteries could be a viable option for cost sensitive areas.
We will present first results on Mg secondary battery cells using a V2O5 cathode, Mg-metal anode and an organometallic electrolyte [1]. V2O5 electrodes made from powder show a reversible electrochemical response at potentials between 0 and 2 V vs Mg. However CV measurements indicate that discharge (i.e. Mg intercalation) occurs quite sluggish while during charging two distinct steps can be discriminated. First results on the electrochemical behavior of thin film V2O5 electrodes will also be presented.
[1] D. Aurbach, Z. Lu, A. Schechter, Y. Gofer, H. Gizbar, R. Turgeman, Y. Cohen, M. Moshkovich, and E. Levi, Nature 407, 724 (2000).