In-situ XRD study of the succinonitrile-lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) phase diagram

P. S. Whitfield, A. Abouimrane, I. J. Davidson

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The salt lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) when dissolved in plastic crystal succinonitrile has been demonstrated to have particularly good conductivity even at room temperature. In-situ X-ray diffraction (XRD) measurements have previously proved invaluable in interpreting the differential scanning calorimetry (DSC) behavior, but the practical lower temperature limit of approximately - 45 °C was higher than the - 100 °C starting temperature of the DSC measurements, and the important crystalline to plastic crystal transition of succinonitrile. An improved cryo-flow system capable of capillary sample temperatures down to - 192 °C without icing can now easily match the DSC conditions. The previously puzzling DSC behavior of the succinonitrile-LiTFSI phase diagram at low temperatures has now been explained, with a surprising formation of a TFSI-rich adduct on heating from - 100 °C even at concentrations as low as 2 mol%. Crown

Original languageEnglish
Pages (from-to)740-744
Number of pages5
JournalSolid State Ionics
Issue number15-16
Publication statusPublished - 3 Jun 2010



  • Electrolyte
  • Lithium batteries
  • Phase diagram
  • X-ray diffraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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