Issue 9, 2012

Ionic liquid-nanoparticle hybrid electrolytes

Abstract

We investigate physical and electrochemical properties of a family of organic-inorganic hybrid electrolytes based on the ionic liquid 1-methyl-3-propylimidazolium bis(trifluoromethanesulfone) imide covalently tethered to silica nanoparticles (SiO2-IL-TFSI). The ionic conductivity exhibits a pronounced maximum versusLiTFSI composition, and in mixtures containing 13.4 wt% LiTFSI, the room-temperature ionic conductivity is enhanced by over 3 orders of magnitude relative to either of the mixture components, without compromising lithium transference number. The SiO2-IL-TFSI/LiTFSI hybrid electrolytes are thermally stable up to 400 °C and exhibit tunable mechanical properties and attractive (4.25V) electrochemical stability in the presence of metallic lithium. We explain these observations in terms of ionic coupling between counterion species in the mobile and immobile (particle-tethered) phases of the electrolytes.

Graphical abstract: Ionic liquid-nanoparticle hybrid electrolytes

Supplementary files

Article information

Article type
Paper
Submitted
20 Oct 2011
Accepted
04 Jan 2012
First published
25 Jan 2012

J. Mater. Chem., 2012,22, 4066-4072

Ionic liquid-nanoparticle hybrid electrolytes

Y. Lu, S. S. Moganty, J. L. Schaefer and L. A. Archer, J. Mater. Chem., 2012, 22, 4066 DOI: 10.1039/C2JM15345A

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