Improvement of charge/discharge properties of oligoether electrolytes by zwitterions with an attached cyano group for use in lithium-ion secondary batteries

Seitaro Yamaguchi, Masahiro Yoshizawa-Fujita*, Haijin Zhu, Maria Forsyth, Yuko Takeoka, Masahiro Rikukawa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Zwitterions with a cyano group on the side chain (CZ) were synthesized. Although the addition of CZ caused a slightly negative effect on viscosity, ionic conductivity, limiting current density, and lithium transference number, the oxidation limit of PEGDME/lithium bis(trifluoromethylsulfonyl)amide (LiTFSA) composites was improved to over 5 V. For charge/discharge testing using Li|electrolyte|LiCoO2 cells, the cycle stability of PEGDME/LiTFSA with CZ in the voltage range of 3.0-4.6 V was much higher than that of PEGDME/LiTFSA. Incorporating a small mole fraction of CZ into PEGDME-based electrolytes prevented an increase in the interface resistance between the electrolyte and cathode with increasing numbers of the cycle.

Original languageEnglish
Pages (from-to)471-477
Number of pages7
JournalElectrochimica Acta
Volume186
DOIs
StatePublished - 20 Dec 2015
Externally publishedYes

Keywords

  • Cyano-group
  • Ionic liquid
  • Lithium-ion battery
  • Polymer electrolyte
  • Zwitterion

Fingerprint

Dive into the research topics of 'Improvement of charge/discharge properties of oligoether electrolytes by zwitterions with an attached cyano group for use in lithium-ion secondary batteries'. Together they form a unique fingerprint.

Cite this