Mass transport properties in quasi-solidified lithium-ion conducting ionic liquids at oxide particle surfaces

Atsushi Unemoto, Yoshiki Iwai, Satoshi Mitani, Seung Wook Baek, Seitaro Ito, Takaaki Tomai, Junichi Kawamura, Itaru Honma

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Lithium-ion conducting RTIL-Li-salt mixtures, 1MLi-TFSA/EMI-TFSA and 1MLi-FSA/EMI-FSA, were quasi-solidified at fumed SiO 2 particle surfaces. The electrical conductivities and the self-diffusion coefficients of the constituent species of the RTIL-Li-salt bulks and the composite materials, x vol%1MLi-TFSA/EMI-TFSA-fumed SiO 2 and x vol%1MLi-FSA/EMI-FSA-fumed SiO 2 (x = 100, 75 and 50), were evaluated. We have successfully quasi-solidified RTIL-Li-salts at fumed SiO 2 surfaces even though most of the composites are consisting of RTIL-Li-salts such as x = 75-80. The quasi-solid-state composites had liquid-like high electrical conductivities, e.g. 3.2 × 10 - 4 to 4.4 × 10 - 3 S cm - 1 for 75 vol%1MLi-TFSA/EMI-TFSA-fumed SiO 2 and 6.4 × 10 - 4 to 5.4 × 10 - 3 S cm - 1 for 75 vol%1MLi-FSA/EMI-FSA-fumed SiO 2, in the temperature range of 283-348 K. The self-diffusion coefficients of all constituent species become small as volume ratio of RTIL-Li-salt mixtures decreased. The effect of fumed silica surface on the transport properties of the RTILs depended on the RTIL structures. By receiving the effect from fumed silica surfaces, the disassociation of the ion pair, [EMI +][TFSA -], progressed for 1MLi-TFSA/EMI-TFSA while the Li-containing species lost their diffusivities for 1MLi-FSA/EMI-FSA.

Original languageEnglish
Pages (from-to)416-419
Number of pages4
JournalSolid State Ionics
Publication statusPublished - 2012 Oct 4


  • Dynamics
  • Interface
  • Lithium-ion conductor
  • Quasi-solidification
  • Room temperature ionic liquid


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