The Origins of Ion Conductivity in MOF-Ionic Liquids Hybrid Solid Electrolytes

Roman Zettl, Ilie Hanzu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Fast Li+ solid ion conductors are a key component of all-solid-state batteries, a technology currently under development. The possible use of metallic lithium as active material in solid-state batteries warrants a quantum step improvement of battery specific energy, enabling further electric vehicles application. Hereby, we report the synthesis and ion conduction properties of a new solid hybrid electrolyte based on the MIL-121 metal organic framework (MOF) structure. After an ion exchange procedure that introduces Li+ in the structure, a known quantity of a soaking electrolyte is incorporated. The soaking electrolyte is based on the EMIM-TFSI ionic liquid, thus we can classify our formulation as a MOF–ionic liquid hybrid solid electrolyte. Electrical conductivity is investigated by impedance spectroscopy and preliminary studies of ion dynamics are conducted by 7Li NMR. The field of MOF-based ion conductors remains in incipient stages of research. Our report paves the way towards the rational design of new solid-state ion conductors.

Original languageEnglish
Article number714698
JournalFrontiers in Energy Research
Publication statusPublished - 8 Oct 2021


  • conductivity spectroscopy
  • ion conduction
  • ionic Liquids
  • metal organic framework (MOF)
  • solid electrolytes
  • solid-state batteries

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Economics and Econometrics


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