Effect of EtOMgCl Salt to Suppress Reductive Decomposition of TFSI<sup>−</sup> Anion in Electrolyte for Magnesium Rechargeable Battery

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  • NAKABAYSHI Yukihiro
    Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
  • SAITO Makoto
    Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University
  • KANAMURA Kiyoshi
    Department of Applied Chemistry for Environment, Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University

説明

<p>The relationship between reductive decomposition of anion and the efficiency of magnesium deposition was investigated in magnesium bis(trifluoromethane sulfonyl)imide (Mg(TFSI)2) salt and triglyme (G3) solvent without and with magnesium ethoxy chloride (EtOMgCl) salt. Cyclic voltammetry, energy dispersive X-ray spectroscopy analysis, in situ infrared spectroscopy during deposition–dissolution of magnesium and Raman spectroscopy were conducted. Coulombic efficiency for magnesium deposition was also calculated by chrono amperometry. In Mg(TFSI)2/G3 (molar ratio of 1/15), magnesium was hardly deposited. In EtOMgCl/Mg(TFSI)2/G3 (molar ratio of 2/1/15), magnesium was deposited efficiently. The reduction of TFSI− anion occurred in Mg(TFSI)2/G3 during magnesium deposition, while the reduction was suppressed in EtOMgCl/Mg(TFSI)2/G3. The addition of EtOMgCl salt can suppress the reduction of TFSI− anion, leading to highly efficient magnesium deposition.</p>

収録刊行物

  • Electrochemistry

    Electrochemistry 90 (3), 037010-037010, 2022-03-25

    公益社団法人　電気化学会

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