Journal
ELECTROCHIMICA ACTA
Volume 186, Issue -, Pages 471-477Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.11.018
Keywords
Zwitterion; Cyano-group; Polymer electrolyte; Lithium-ion battery; Ionic liquid
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [26410140]
- Grants-in-Aid for Scientific Research [26410140] Funding Source: KAKEN
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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 vertical bar electrolyte vertical bar 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. (C) 2015 Elsevier Ltd. All rights reserved.
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