Investigating the reversibility of in situ generated magnesium organohaloaluminates for magnesium deposition and dissolution

Christopher J. Barile, Russell Spatney, Kevin R. Zavadil, Andrew A. Gewirth

Research output: Contribution to journalArticlepeer-review

Abstract

We compare the electrochemistry of Mg deposition and stripping from Mg(AlCl2EtBu)2 in THF, a common electrolyte used in Mg-ion battery prototypes, with EtMgBr, a simple Grignard reagent. Electrochemical quartz crystal microbalance measurements demonstrate that mass is gained and lost from the electrode with relatively high efficiency. However, the corresponding Coulombic efficiency is considerably less than the expected 100% for early stage cycles. SEM-EDS analysis shows accumulation of Mg and electrolyte constituents after stripping, highlighting the irreversibility of the Mg deposition and stripping process. GC-MS and NMR analysis of electrolytes reveal decomposition of the solvent-electrolyte system. These findings suggest that Mg organohaloaluminates are not ideal for use in robust Mg-ion batteries.

Original languageEnglish (US)
Pages (from-to)10694-10699
Number of pages6
JournalJournal of Physical Chemistry C
Volume118
Issue number20
DOIs
StatePublished - May 22 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • General Energy
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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