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Updated: Mar 13, 2026

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
Magnesocene-Based Electrolytes: A New Class of Electrolytes for Magnesium Batteries
Rainer Schwarz1, Marijana Pejic1, Philipp Fischer1
1ZSW-Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg, Helmholtzstraße 8, 89081, Ulm, Germany.
Abstract:
Unlike ferrocene, bis(η5 -cyclopentadienyl)magnesium (magnesocene, MgCp2 ) is slightly dissociated in solvents, such as ethers, resulting in electrolyte solutions with low conductivity. MgCp2 /tetrahydrofuran solutions make possible reversible magnesium plating and stripping with low over-potentials for many cycles. The Mg deposits appear with a cauliflower-like morphology. IR and NMR spectroscopy confirm that the electrolyte is stable and not decomposed during prolonged cycling. The anodic stability limit is in the range of 1.5 V (at platinum) and 1.8 V versus Mg/Mg2+ (at stainless steel), which may be sufficient for low-voltage cathode materials. MgCp2 is a first example of a completely new class of halide-free electrolytes, which may open up a new research direction for future magnesium metal and magnesium-ion batteries.
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