Hexafluorophosphate-Based Solutions for Mg Batteries and the Importance of Chlorides

Ivgeni Shterenberg, Michael Salama, Yosef Gofer, Doron Aurbach

Research output: Contribution to journalArticlepeer-review

42 Scopus citations


The selection of viable conventional magnesium salts in electrolyte solutions for Mg secondary batteries is very limited. Reversible magnesium deposition was demonstrated with only MgTFSI2, in ethereal solutions. A recent report has suggested that Mg can be reversibly deposited from a solution of Mg(PF6)2 in tetrahydrofuran and acetonitrile. In this paper, we dispute that claim and show that PF6- anions passivate Mg anodes and completely inhibit any Mg deposition/dissolution process. We show that addition of chlorides suppresses the passivation phenomena and allows reversible Mg deposition/dissolution processes to commence. The Mg deposits have been examined via elemental analysis, scanning electron microscopy, and X-ray diffraction measurements, depicting a highly oriented, preferential Mg growth. This study evaluates the feasibility of employing PF6-based electrolytes for Mg batteries and exemplifies the aptitude of chlorides for suppressing passivation phenomena.

Original languageEnglish
Pages (from-to)9472-9478
Number of pages7
Issue number37
StatePublished - 19 Sep 2017

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© 2017 American Chemical Society.


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