File(s) under permanent embargo
Lithium doped N-methyl-N-ethylpyrrolidiniumbis(trifluoromethanesulfonyl)amide fast-ion conducting plastic crystals
journal contribution
posted on 2000-01-01, 00:00 authored by Maria ForsythMaria Forsyth, J Huang, D MacFarlaneThe incorporation of dopant levels of lithium ions (0.5 to 9.3% by mole) in the N-methyl-N-ethylpyrrolidinium bis(trifluoromethanesulfonyl)amide (P12TFSA) plastic crystalline phase results in increases in the solid state ionic conductivity of more than 3 orders of magnitude at 298 K. Conductivities as high as 10−-4 S cm−1 at 323 K have been measured in these doped plastic crystal phases. These materials can therefore be classified as fast-ion conductors. Higher levels of Li only marginally increase the conductivity, up to around 33 mol%, followed by a slight decrease to 50 mol%. Thermal analysis behaviour has allowed the partial development of the binary phase diagram for the LiTFSA–P12TFSA system between 0–50 mol% LiTFSA, which suggests the presence of a solid solution single phase at concentrations less than 9.3 mol% LiTFSA. There is also strong evidence of eutectic behaviour in this system with a eutectic transition temperature around 308 K at 33 mol% LiTFSA. A model relating ionic conduction to phase behaviour in this system is presented. The increased conductivity upon doping has been associated with lithium ion motion via7Li solid state NMR linewidth measurements.
History
Journal
Journal of materials chemistryVolume
10Issue
10Pagination
2259 - 2265Publisher
Royal Society of ChemistryLocation
Cambridge, EnglandPublisher DOI
ISSN
0959-9428eISSN
1364-5501Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2000, Royal Society of ChemistryUsage metrics
Categories
No categories selectedKeywords
Licence
Exports
RefWorks
BibTeX
Ref. manager
Endnote
DataCite
NLM
DC