論文

査読有り
2016年8月15日

Characteristics of tetrahydrofuran-?based electrolytes with magnesium alkoxide additives for rechargeable magnesium batteries

Journal of Power Sources
  • In-Tae Kim
  • ,
  • Kazuhiro Yamabuki
  • ,
  • Michinori Sumimoto
  • ,
  • Hiromori Tsutsumi
  • ,
  • Masayuki Morita
  • ,
  • Nobuko Yoshimoto

323
開始ページ
51
終了ページ
56
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1016/j.jpowsour.2016.05.045

© 2016 Elsevier B.V. All rights reserved. The electrochemical behavior of magnesium (Mg) metal was investigated in tetrahydrofuran (THF)-based solutions containing magnesium bromide (MgBr 2 ) and/or magnesium ethoxide (Mg(OEt) 2 ). THF solutions containing a single solute, MgBr 2 or Mg(OEt) 2 , show no visible faradaic current based on Mg deposition and/or dissolution. However, the electrolyte system containing both solutes, MgBr 2 + Mg(OEt) 2 /THF, gives a reversible current response of Mg deposition and dissolution. The ionic structure of the electrolyte system containing the binary solute was examined by infrared (IR) spectroscopy and density functional theory (DFT) calculations. It was confirmed that MgBr 2 and Mg(OEt) 2 are coordinated (solvated) with THF molecules to form an EtO-Mg-Br·4THF complex. The DFT calculations also suggest the possible formation of μ-complexes for the MgBr 2 /Mg(OEt) 2 binary system in THF. The voltammetric responses at the Pt electrode indicate low overpotential and high coulombic efficiency for Mg deposition and dissolution in THF-based solutions containing suitable molar ratios of MgBr 2 and Mg(OEt) 2 . The constant-current charge-discharge cycling of Mg in MgBr 2 + Mg(OEt) 2 /THF electrolyte also shows low overpotential and good cyclability over 300 cycles.

リンク情報
DOI
https://doi.org/10.1016/j.jpowsour.2016.05.045
J-GLOBAL
https://jglobal.jst.go.jp/detail?JGLOBAL_ID=201602246518098664
URL
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84969513546&origin=inward

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