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

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

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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
Volume181
Issue number15-16
DOIs
Publication statusPublished - 3 Jun 2010
Externally publishedYes

Fingerprint

succinonitrile
Imides
imides
Lithium
Phase diagrams
heat measurement
lithium
phase diagrams
Differential scanning calorimetry
X ray diffraction
scanning
diffraction
x rays
plastics
ice formation
Temperature
Plastics
Crystals
adducts
crystals

Keywords

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

ASJC Scopus subject areas

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

Cite this

In-situ XRD study of the succinonitrile-lithium bis(trifluoromethylsulfonyl)imide (LiTFSI) phase diagram. / Whitfield, P. S.; Abouimrane, Ali; Davidson, I. J.

In: Solid State Ionics, Vol. 181, No. 15-16, 03.06.2010, p. 740-744.

Research output: Contribution to journalArticle

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N2 - 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

AB - 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

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