Magnesium Anode Pretreatment Using a Titanium Complex for Magnesium Battery

Taeeun Yim, Sang Gil Woo, Si Hyoun Lim, Jong Yeol Yoo, Woosuk Cho, Min Sik Park, Young Kyu Han, Young Jun Kim, Jisang Yu

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Although magnesium batteries have received a great deal of attention as a promising power source, the native oxide layer on the Mg surface significantly impedes practical applications, because of the sluggish kinetic behavior of Mg-ion deposition and dissolution. Here, a new approach to improve electrochemical reactivity of Mg anode is proposed, based on chemical pretreatment of the Mg anode using a titanium complex, Ti(TFSI)2Cl2, that effectively removes the native oxide layer on the Mg anode surface. The pretreatment of the Mg anode by Ti(TFSI)2Cl2 remarkably decreases the binding affinity between Mg and O via the formation of a multicoordinate complex (Mg-O-Ti). Thereafter, a series of chemical reactions cleave the Mg-O bonds, resulting in a fresh Mg surface. This creates a cell comprised of the Ti(TFSI)2Cl2-pretreated Mg anode, glyme-based electrolytes, and cathode material that exhibits reversible electrochemical behavior at the electrode/electrolyte interface, resulting in practical applicability and good electrochemical performance.

Original languageEnglish
Pages (from-to)5733-5739
Number of pages7
JournalACS Sustainable Chemistry and Engineering
Volume5
Issue number7
DOIs
StatePublished - 3 Jul 2017

Keywords

  • magnesium battery
  • reaction mechanism
  • sluggish kinetics
  • surface chemistry
  • titanium complex

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