New organic-inorganic crystalline electrolytes synthesized from 12-phosphotungstic acid and the ionic liquid [BMIM][TFSI]

Je Deok Kim, Shigenobu Hayashi, Mitsuko Onoda, Akira Sato, Chikashi Nishimura, Toshiyuki Mori, Itaru Honma

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

New organic-inorganic hybrid crystalline electrolytes comprised of 12-phosphotungstic acid (PWA) and the ionic liquid [1-butyl-3-methylimidazole][bis-(fluoromethanesulfonyl)amide] ([BMIM][TFSI]) with high thermal stability and high ion conductivity at high temperatures were obtained. In the new hybrids, there was a strong interaction between [BMIM]+ of the ionic liquid and PWA. The hybrids were very stable up to about 400 °C and showed a high ion jump during heating and cooling processes. Based on results from TG-DTA, DSC, and NMR spectroscopy, the ion jump was due to melting and solidification of the hybrid. The structures of powder and single-crystal samples of the hybrids were also studied. The chemical formula of the hybrid in the single crystal was determined to be PW13C32H56O54N8S0.16F0.26. This is nearly the same as those determined from the powder samples. By analyzing single-crystal X-ray diffraction (XRD) data, the hybrid was determined to crystallize in the space group Pca21 with the lattice constants a = 18.316(3), b = 18.327(3), and c = 16.657(3) Å. The powder XRD data of the hybrid were assigned.

Original languageEnglish
Pages (from-to)7638-7643
Number of pages6
JournalElectrochimica Acta
Volume53
Issue number26
DOIs
Publication statusPublished - 2008 Nov 1
Externally publishedYes

Keywords

  • 12-Phosphotungstic acids (PWA)
  • Ion conductor
  • Ionic liquid
  • Organic-inorganic crystal
  • [BMIM][TFSI]

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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