Enhanced lithium ionic conductivity of lithium perchlorate in the metal-organic framework matrix

Artem Ulihin, Valentina Ponomareva, Nikolai Uvarov, Konstantin Kovalenko, Vladimir Fedin

Research output: Contribution to journalArticlepeer-review

Abstract

Nanocomposite solid electrolytes were prepared by impregnation of LiClO4 into pores of the metal-organic framework Cr3[C6H4(COO)2]3F (MIL-101(Cr)), and their conductivity was investigated. At temperatures 25–150 °C and relative humidity of 50%, the composites easily absorb water with formation liquid phase in the pores and have conductivity values typical for water solutions. Conductivity decreases with diminishing the humidity; however, complete dehydration may be achieved only after prolonged heating in vacuum at 180 °C. The concentration dependence of conductivity of dehydrated samples goes through the maximum at nearly 6 mol% of MIL-101(Cr) and reaches 3 × 10−3 S/cm at 160 °C; the activation energy decreases in the nanocomposites. Using the volt-amperometric technique on the sample with two nickel electrodes, the electrochemical decomposition voltage value was found to be nearly 3.5 V at 160 °C. It suggests that the ionic conductivity is caused by lithium cations rather than protons or electrons.

Original languageEnglish
Pages (from-to)6167-6173
Number of pages7
JournalIonics
Volume26
Issue number12
DOIs
Publication statusAccepted/In press - Apr 2020

Keywords

  • Decomposition voltage
  • Effect of humidity on conductivity
  • High lithium ion conductivity
  • Metal-organic frameworks
  • MIL-101(Cr)
  • Nanocomposite solid electrolytes
  • OXIDE
  • VAPOR ADSORPTION
  • MIL-101(CR)
  • CONDUCTORS
  • COMPOSITE SOLID ELECTROLYTES
  • KINETICS
  • RECENT PROGRESS

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