Effect of zwitterions on electrochemical properties of oligoether-based electrolytes

Mitsutake Suematsu, Masahiro Yoshizawa-Fujita*, Haijin Zhu, Maria Forsyth, Yuko Takeoka, Masahiro Rikukawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Solid polymer electrolytes show great potential in electrochemical devices. Poly(ethylene oxide) (PEO) has been studied as a matrix for solid polymer electrolytes because it has relatively high ionic conductivity. In order to investigate the effect of zwitterions on the electrochemical properties of poly(ethylene glycol) dimethyl ether (G5)/lithium bis(fluorosulfonyl) amide (LiFSA) electrolytes, a liquid zwitterion (ImZ2) was added to the G5-based electrolytes. In this study, G5, which is a small oligomer, was used as a model compound for PEO matrices. The thermal properties, ionic conductivity, and electrochemical stability of the electrolytes with ImZ2 were evaluated. The thermal stabilities of all the G5-based electrolytes with ImZ2 were above 150°C, and the ionic conductivity values were in the range of 0.8-3.0 mS cm-1 at room temperature. When the electrolytes contained less than 5.5 wt% ImZ2, the ionic conductivity values were almost the same as that of the electrolyte without ImZ2. The electrochemical properties were improved with the incorporation of ImZ2. The anodic limit of the electrolyte with 5.5 wt% ImZ2 was 5.3 V vs. Li/Li+, which was over 1 V higher than that of G5/LiFSA.

Original languageEnglish
Pages (from-to)209-213
Number of pages5
JournalElectrochimica Acta
Volume175
DOIs
StatePublished - 22 Aug 2015
Externally publishedYes

Keywords

  • Electrochemical window
  • Lithium-ion battery
  • Oligoether
  • Polymer electrolyte
  • Zwitterion

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