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 language | English |
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Pages (from-to) | 471-477 |
Number of pages | 7 |
Journal | Electrochimica Acta |
Volume | 186 |
DOIs | |
State | Published - 20 Dec 2015 |
Externally published | Yes |
Keywords
- Cyano-group
- Ionic liquid
- Lithium-ion battery
- Polymer electrolyte
- Zwitterion