1-butyl 3 methylimidazolium bis(trifluoromethane sulfonyl) imide (bmim-bistriflimide)
DESCRIPTION
–. +. 1.0. 0.1. OHD-OKE signal. Data and theoretical fit. Data cover more than three decades of time and three decades of signal amplitude. 0.01. 0.001. t (ps). Room Temperature Ionic Liquids The Influence of Lithium Cations Michael D. Fayer, Stanford University, DMR 0652232. - PowerPoint PPT PresentationTRANSCRIPT
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No Li+ Low Conc.Li+
High Conc.Li+
figure 8figure 8
No Li+ Low Conc.Li+
High Conc.Li+
Room temperature ionic liquids (RTILs) are the object of extensive study due to their unique properties including very low vapor pressure and non-flammability, selective reaction medium, etc. RTILs are being studied actively as alternative solvents in lithium ion batteries, which currently use organic compounds as solvents. Organic solvents present safety issues due to volatility and high flammability. Thus RTILs could become greener and safer alternatives.
The Fayer group has made great progress in understanding the effects of lithium cations, on the dynamics of bmIm-bistriflimide (see fig.), which isimportant because of its redox properties. Opticalheterodyne detected optical Kerr effect (OHD-OKE) experiments were used to study the dynamics as a function of Li+ concentration and temperature.
The experimental results, (see fig.), indicate that there is a structural and dynamical break at a Li+-bistriflimide mole fraction of 0.19. The nature of the change is illustrated schematically in the bottom figure. The solvation of Li+ changes fromtwo anions to four anions.
Room Temperature Ionic LiquidsRoom Temperature Ionic LiquidsThe Influence of Lithium CationsThe Influence of Lithium Cations
Michael D. Fayer, Stanford University, DMR 0652232
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1-butyl 3 methylimidazolium1-butyl 3 methylimidazoliumbis(trifluoromethane bis(trifluoromethane sulfonyl) imidesulfonyl) imide (bmIm-bistriflimide)(bmIm-bistriflimide)
T = 296 K
t (ps)O
HD
-OK
E s
ign
al
0.001
0.01
0.1
1.0
Data and theoretical fit.Data cover more thanthree decades of timeand three decades ofsignal amplitude.
Bringing Quantum Chemistry to the PublicBringing Quantum Chemistry to the PublicMichael D. Fayer, Stanford University, DMR 0652232
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