Ionic liquid-nanoparticle hybrid electrolytes

Lu, Y.; Moganty, S.S.; Schaefer, J.L.; Archer, L.A.

Ionic liquid-nanoparticle hybrid electrolytes

Abstract

e 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 versus LiTFSI 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.

Sponsorship

This publication was based on work supported in part by Award No. KUS-C1-018-02, made by King Abdullah University of Science and Technology (KAUST) and by the National Science Foundation, Award No. DMR-1006323. Facilities available through the Cornell Center for Materials Research(CCMR),National Science Foundation Award No. DMR-1120296, were also used for this study.

Date Issued

2012-01-25

Publisher

The Royal Society of Chemistry

Keywords

Hybrid electrolytes; Ionic liquid

Previously Published As

Ionic liquid-nanoparticle hybrid electrolytes, 22, 9, (4066-4072)

Types

article