Bulk and interfacial ionic conduction in LiI/Al2O3 mixtures

Gilat Ardel, Dina Golodnitsky, Emanuel Peled, Yifeng Wang, Gang Wang, Stanley Bajue, Steven Greenbaum*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We have studied physical mixtures of LiI and nanoscale particles of Al2O3, prepared in pellet form under pressure, by X-ray diffraction, complex impedance, and wide-line 7Li and 127I and high resolution 7Li NMR spectroscopy. Enhancement in ionic conductivity by the addition of Al2O3 is observed, although there is also an increase in grain boundary resistance. The high resolution (MAS) NMR method clearly resolves two or more distinct Li+ sites, one characteristic of bulk LiI and the rest associated with surface/interface regions. The site populations depend strongly on mix composition and temperature, and are correlated with the ionic conductivity behavior.

Original languageEnglish
Pages (from-to)477-485
Number of pages9
JournalSolid State Ionics
Volume113-115
DOIs
StatePublished - 1 Dec 1998

Keywords

  • Complex impedance
  • Interfacial effects
  • Lithium iodide
  • Lithium-7 NMR
  • Nano-crystalline alumina

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