NDLI: Investigation of the solution condition of lithium electrolyte solutions with LiCF3SO3 salt

Content Provider	Springer Nature Link
Author	Saito, Y. Yamamoto, H. Kageyama, H. Nakamura, O. Miyoshi, T. Matsuoka, M.
Copyright Year	2000
Abstract	Solution condition of the lithium electrolyte of LiCF$_{3}$SO$_{3}$ salt dissolved in propylene carbonate (PC), dimethoxyethane (DME) and tetrahydrofuran (THF) were investigated based on the measurements of the self-diffusion coefficients of lithium (D$_{Li}$) and anion (D$_{F}$) species using the pulsed-field gradient (PFG) NMR, viscosity and conductivity. D$_{Li}$ and D$_{F}$ decreased with the increase in the solution concentration for these electrolytes. This result reflects the change in the dissociation degree of the salt and the viscosity depending on the solution concentration. In the case of PC solution (the dielectric constant (∈) of PC: ∼65), measured D$_{Li}$ and D$_{F}$ were separated each other with the decrease in the concentration because the dissociation of the salt was promoted to increase the content of dissociated ions. With an increase in the concentration, the dissociation would be restricted and D$_{Li}$ and D$_{F}$ approximated each other, which means that the associated ion pairs are dominant in the solution. The effective ionic radius (r$_{eff}$) of cation species of PC solution estimated from the Stokes-Einstein relation using the diffusion coefficient and the viscosity results was four times greater than that of the naked lithium ion and independent of the dissociation degree. On the other hand, the r$_{eff}$ of anion species changed depending on the dissociation degree. This suggests that the dissociated lithium ions are solvated by the PC solvent in the solution. DME and THF solutions did not show the solvation effect from the result of the change in r$_{eff}$ with the concentration. This suggests that the dissociation degree of the dissolved salt was low due to the low ∈ of their solvents (∈ ∼ 7.2) and the ion pairs would dominant in the solutions independent of the solution concentration.
Starting Page	809
Ending Page	812
Page Count	4
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	35
Issue Number	4
e-ISSN	15734803
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation Materials Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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