Abstract
Four pyrrolidium (PY)-based ILs were synthesized from TFSI- ions and PY + ions functionalized by butyl, butyronitrile, pentenyl, and methyl butyrate as an electrolyte for Li ion batteries. The ILs with a lower T m had a much higher viscosity and lower conductivity because of the biased electron distribution in their quaternary ammonium cations. The potential windows of the ILs demonstrated stability above 5.0 V and all of the synthesized ILs showed evidence of forming a SEI layer on the graphite electrode. The peak currents for reduction on the graphite electrode and for oxidation on the LiCoO 2 electrode were 100 times stronger in PY(butyl)TFSI and PY(pentenyl)TFSI than in PY(butyronitrile)TFSI and PY(methyl butyrate)TFSI. This difference resulted from the electrolyte conductivity which is deeply related to the solvation strength between Li + ions and the functional groups of the ILs.
Original language | English |
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Pages (from-to) | 6220-6234 |
Number of pages | 15 |
Journal | International Journal of Electrochemical Science |
Volume | 6 |
Issue number | 12 |
State | Published - Dec 2011 |
Keywords
- Functional group
- Ionic liquid
- Li ion batteries
- Pyrrolidinium