magnesium Electrolyte - New Electrolyte Class for Magnesium

A study on Bis(η5-cyclopentadienyl)-magnesium
Electrolyte - New Electrolyte Class for Magnesium
Batteries
Rainer Schwarz, Marijana Pejic, Mario Wachtler
ZSW - Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg
Helmholtzstr. 8, 89081 Ulm - Germany
Corresponding author: [email protected]
Today’s energy storage technology is continuously challenged by technological
progress and future demands in efficiency, capacity, availability and price. At the
moment, multiple advanced alternatives, like sodium or magnesium based systems
are undergoing intense research efforts. To the future demands, the energy
dense, 2205 mAh.g-1, abundant and cheap magnesium is an excellent answer.
This promising alternative is still in the research stage and faces major roadblocks
until its commercialization. At the current state of research, the highly favoured,
magnesium metal anode is only compatible with either magnesium-organo-borate
or magnesium-organo-aluminate electrolytes. It seems that conventional electrolyte
solvents and most magnesium salts form a passivating, magnesium
ion impermeable, surface layer during electrochemical cycling. [1- 4]
Here we present a completely new class of electrolytes for magnesium batteries,
based on bis(η5-cyclopentadienyl)-magnesium. The electrolyte is highly suitable for
a metallic magnesium anode. We present a complete electrolyte characterisation electrochemical testing, SEM, XRD, IR and NMR investigations.
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