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Effect of zwitterions on electrochemical properties of oligoether-based electrolytes

Version 2 2024-06-03, 12:35
Version 1 2015-02-16, 20:20
journal contribution
posted on 2024-06-03, 12:35 authored by M Suematsu, M Yoshizawa-Fujita, H Zhu, Maria ForsythMaria Forsyth, Y Takeoka, M Rikukawa
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.

History

Journal

Electrochimica Acta

Volume

175

Pagination

209-2013

Location

Amsterdam, The Netherlands

ISSN

0013-4686

Language

eng

Publication classification

C Journal article, C1 Refereed article in a scholarly journal

Copyright notice

2014, Elsevier

Publisher

Elsevier

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