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

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 disp...

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Bibliographic Details
Published inDenki kagaku oyobi kōgyō butsuri kagaku Vol. 90; no. 3; p. 037010
Main Authors NAKABAYSHI, Yukihiro, SAITO, Makoto, KANAMURA, Kiyoshi
Format Journal Article
LanguageEnglish
Published The Electrochemical Society of Japan 25.03.2022
Subjects
In Situ Infrared Spectroscopy
Interfacial Behavior
Magnesium Deposition
Magnesium Rechargeable Battery
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Summary: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.
ISSN:1344-3542
2186-2451
DOI:10.5796/electrochemistry.21-00124