PEO-based polymer electrolytes with ionic liquids and their use in lithium metal-polymer electrolyte batteries

Joon-Ho Shin, Wesley A. Henderson, Stefano Passerini

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Abstract

The influence of adding the room-temperature ionic liquid (RTIL) N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR13TFSI) to P(EO)20LiTFSI polymer electrolytes and the use of these electrolytes in solid-state Li/V2O5batteries has been investigated. P(EO)20LiTFSI + xPYR13TFSI polymer electrolytes with various PYR13+/Li+mole fractions (x = 0.66,1.08, 1.73, 1.94, 2.15, and 3.24) were prepared. The addition of up to a 3.24 mole fraction of the RTIL to P(EO)20LiTFSI electrolytes, corresponding to a RTIL/PEO weight fraction of up to 1.5, resulted in freestanding and highly conductive electrolyte films reaching 10-3S/cm at 40°C. The electrochemical stability of PYR13TFSI was significantly improved by the addition of LiTFSI. Li/V2O5cells using the polymer electrolyte with PYR13TFSI showed excellent reversible cyclability with a capacity fading of 0.04% per cycle over several hundreds cycles at 60°C. The incorporation of the RTIL into lithium metal-polymer electrolyte batteries has resulted in a promising improvement in performance at moderate to low temperatures. © 2005 The Electrochemical Society. All rights reserved.
Original languageEnglish
Pages (from-to)-
JournalJournal of the Electrochemical Society
Volume152
Issue number5
DOIs
Publication statusPublished - 2005
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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