Prospects for Improved Magnesocene-Based Magnesium Battery Electrolytes
Journal article, 2021

Magnesium batteries are currently attracting a lot of interest as a next generation battery technology. One critical issue is to find a suitable electrolyte and herein we explore an electrolyte based on magnesocene (MgCp2) in tetrahydrofuran (THF), aiming for low-voltage Mg batteries, with respect to: Mg plating characteristics, electrochemical stability windows, electrolyte speciation, and electrolyte decomposition reactions; both experimentally and computationally. Overall, the electrolyte does not seem to decompose on a Mg metal anode and most likely reduced solvation of Mg2+ by the Cp- anion is important and species such as MgCp2THF2 may play an important role for Mg plating with small overpotential. The oxidation limit is largely determined by the Cp- anion and density functional theory predicted oxidation reactions point to polymerized end-products to be possible. Furthermore, in silico substitution studies enable us to establish the prospects of some Cp- anion derivatives to further improve the oxidative stability, but still the Mg2+ solvation must be monitored for ease of reduction and Mg plating.

density functional theory

electrolyte decomposition reactions

bis(cyclopentadienyl) magnesium

magnesium electroplating

electrochemical stability window

Author

Piotr Jankowski

Warsaw University of Technology

Chalmers, Physics, Materials Physics

Technical University of Denmark (DTU)

Alistore - European Research Institute

Rainer Schwarz

Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Wurttembergstiftung (ZSW)

Anna Randon-Vitanova

Honda R&D Europe (Germany) GmbH

Reza Younesi

Uppsala University

Alistore - European Research Institute

Mario Wachtler

Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Wurttembergstiftung (ZSW)

Uppsala University

Patrik Johansson

Alistore - European Research Institute

Chalmers, Physics, Materials Physics

BATTERIES & SUPERCAPS

2566-6223 (eISSN)

Vol. In Press

Subject Categories

Inorganic Chemistry

Other Chemical Engineering

Other Chemistry Topics

DOI

10.1002/batt.202100040

More information

Latest update

5/31/2021