Reversible Magnesium Metal Cycling in Additive-Free Simple Salt Electrolytes Enabled by Spontaneous Chemical Activation

A. Re Jeon, Seungyun Jeon, Gukhyun Lim, Juyoung Jang, Woo Joo No, Si Hyoung Oh, Jihyun Hong, Seung Ho Yu, Minah Lee

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Rechargeable magnesium (Mg) batteries can offer higher volumetric energy densities and be safer than their conventional counterparts, lithium-ion batteries. However, their practical implementation is impeded due to the passivation of the Mg metal anode or the severe corrosion of the cell parts in conventional electrolyte systems. Here, we present a chemical activation strategy to facilitate the Mg deposition/stripping process in additive-free simple salt electrolytes. By exploiting the simple immersion-triggered spontaneous chemical reaction between reactive organic halides and Mg metal, the activated Mg anode exhibited an overpotential below 0.2 V and a Coulombic efficiency as high as 99.5% in a Mg(TFSI)2electrolyte. Comprehensive analyses reveal simultaneous evolution of morphology and interphasial chemistry during the activation process, through which stable Mg cycling over 990 cycles was attained. Our activation strategy enabled the efficient cycling of Mg full-cell candidates using commercially available electrolytes, thereby offering possibilities of building practical Mg batteries.

Original languageEnglish
Pages (from-to)8980-8991
Number of pages12
JournalACS nano
Volume17
Issue number10
DOIs
Publication statusPublished - 2023 May 23

Bibliographical note

Publisher Copyright:
© 2023 American Chemical Society. All rights reserved.

Keywords

  • Mg activation
  • Mg(TFSI)
  • alkyl halide
  • artificial interphase
  • nanostructuring
  • simple salt electrolyte

ASJC Scopus subject areas

  • General Materials Science
  • General Engineering
  • General Physics and Astronomy

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