Evaluation of Mg[B(HFIP)4]2-Based Electrolyte Solutions for Rechargeable Mg Batteries

Ben Dlugatch, Meera Mohankumar, Ran Attias, Balasubramoniam Murali Krishna, Yuval Elias, Yosef Gofer, David Zitoun, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

One of the greatest challenges toward rechargeable magnesium batteries is the development of noncorrosive electrolyte solutions with high anodic stability that can support reversible Mg deposition/dissolution. In the last few years, magnesium electrolyte solutions based on Cl-free fluorinated alkoxyborates were investigated for Mg batteries due to their high anodic stability and ionic conductivity and the possibility of reversible deposition/dissolution in ethereal solvents. Here, the electrochemical performance of Mg[B(hexafluoroisopropanol)4]2/dimethoxyethane (Mg[B(HFIP)4]2/DME) solutions was examined. These electrolyte solutions require a special "conditioning"pretreatment that removes undesirable active moieties. Such a process was developed and explored, and basic scientific issues related to the mechanism by which it affects Mg deposition/dissolution were addressed. The chemical changes that occur during the conditioning process were examined. Mg[B(HFIP)4]2/DME solutions were found to enable reversible Mg deposition, albeit with a relatively low Coulombic efficiency of 95% during the first cycles. Prolonged deposition/dissolution cycling tests demonstrate a stable behavior of magnesium electrodes. Overall, this system presents a reasonable electrolyte solution and can serve as a basis for future efforts to develop chlorine-free alternatives for secondary magnesium batteries. It is clear that such a conditioning process is mandatory, as it removes reactive contaminants that lead to unavoidable passivation and deactivation of Mg electrodes from the solution.

Original languageBritish English
Pages (from-to)54894-54905
Number of pages12
JournalACS Applied Materials and Interfaces
Volume13
Issue number46
DOIs
StatePublished - 24 Nov 2021

Keywords

  • corrosion
  • electrochemical conditioning process
  • halogen-free electrolyte solutions
  • magnesium anodes
  • rechargeable magnesium batteries

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