Beschreibung:
<jats:p>Technological evolution puts up an ever-growing demand on energy storage – challenging today’s technology. However, future needs for capacity, efficiency, availability and price on energy storage devices exceed the current state of the art technology, Lithium-ion, by far and require advanced alternative technologies. Currently, multiple alternatives are still undergoing research efforts. Magnesium batteries are a prime candidate to those future demands - magnesium is energy dense, 2205 mAhg<jats:sup>-1</jats:sup>, abundant and comparatively cheap. [1, 2] </jats:p>
<jats:p>Despite these promising properties, magnesium batteries still face major roadblocks until their commercialization. The favoured, high energy density, magnesium metal anode is, at the current state of research, only compatible with electrolytes based upon either magnesium-organo-halo-aluminates or magnesium-borohydrides. [3, 4] Electrolytes based upon conventional magnesium salts e.g. such as halides, perhalates or imides seem to be incompatible to the magnesium metal surface [5] where the electrolyte degenerates and forms a passivating, magnesium ion impermeable, surface layer. </jats:p>
<jats:p>Here, we would like to report on a new electrolyte system for magnesium batteries, based upon the bis(η5-cyclopentadienyl)-magnesium complex. The proposed electrolyte is highly suitable for a metallic magnesium anode. We will present the results of a comprehensive electrolyte-system characterisation, electrochemical performance testing (Figure 1), SEM and XRD analysis of the deposited magnesium, as well as IR and NMR studies on the fresh and cycled/aged electrolyte. </jats:p>
<jats:p>The presented work introduces a completely new electrolyte class for magnesium batteries. </jats:p>
<jats:p>Figure 1: Cyclic voltammogram of a 0.5 M MgCp<jats:sub>2</jats:sub> in THF solution obtained at a scan rate of 10 mVs<jats:sup>-1 </jats:sup>in a potential range of -0.5 V to 1.2 V vs. Mg/Mg<jats:sup>2+</jats:sup> for 500 cycles; WE: Cu, CE: Mg, RE: Mg. </jats:p>
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<jats:bold>References</jats:bold>
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<jats:p>[1] R. D. Shannon; Acta Cryst., 1976, A32, 751-767 </jats:p>
<jats:p>[2] D. R. Lide (ed.); Section 14, Geophysics, Astronomy, and Acoustics; Abundance of Elements in the Earth's Crust and in the Sea, 85 ed., CRC Press, 2005. </jats:p>
<jats:p>[3] D. Aurbach, Z. Lu, A. Schechter, Y. Gofer, H. Gizbar, R. Turgeman, Y. Cohen, M. Moshkovich, E. Levi.; Nature, 2000, 407, 724 </jats:p>
<jats:p>[4] Mohtadi, R., Matsui, M., Arthur, T. S. and Hwang, S.-J.; Angew. Chem. Int. Ed., 2012, 51, 9780 </jats:p>
<jats:p>[5] O. Tutusaus, R. Mohtadi; ChemElectroChem, 2015, 2, 51-57 </jats:p>
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<jats:bold>Acknowledgement</jats:bold>
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<jats:p>Funding is gratefully provided by BMBF - Project No.03EK3027C</jats:p>
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<jats:p>Figure 1</jats:p>
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