| Title | Molecular environment and enhanced diffusivity of Li+ ions in lithium-salt-doped ionic liquid electrolytes |
|---|---|
| Publication Type | Articolo su Rivista peer-reviewed |
| Year of Publication | 2011 |
| Authors | Castiglione, F., Ragg E., Mele A., Appetecchi Giovanni Battista, Montanino M., and Passerini S. |
| Journal | Journal of Physical Chemistry Letters |
| Volume | 2 |
| Pagination | 153-157 |
| ISSN | 19487185 |
| Keywords | Activation energy, Brownian motion, Brownian movement, Coordination shells, Data support, diffusion, Diffusivities, Electrolytes, Heteronuclear, Ionic liquid electrolytes, Ionic liquids, Ions, Li-ion batteries, Lithium, Lithium salts, Molar ratio, Molecular environment, NMR diffusion, Self-diffusion coefficients, Temperature measurement |
| Abstract | Lithium salts dissolved in ionic liquids (ILs) are interesting alternatives to the commonly used electrolytes for Li-ion batteries. In this study, the solution of Li [bis-(trifluoromethanesulfonyl)imide] (LiTFSI) in N-butyl-N-methylpyrrolidinium TFSI (PYR14TFSI) ionic liquid in the 0.1:0.9 molar ratio is studied by heteronuclear NOE and NMR diffusion measurements. The main purpose is to spot on the interions organization and mobility. NOE data support the existence of strongly coordinated Li+ species, whereas variable temperature measurements of the self-diffusion coefficients D show large, selective, and unexpected enhancement of Li + mobility with T. The measured activation energy for Li+ diffusion is significantly larger than those of TFSI- and PYR 14 +. These findings can be related to the mechanism of Li+ diffusion in ILs based on disruption formation of the coordination shells of Li+ with TFSI anions rather than on the Brownian motion of the whole Li+ coordinated species. © 2011 American Chemical Society. |
| Notes | cited By 61 |
| URL | https://www.scopus.com/inward/record.uri?eid=2-s2.0-79952919712&doi=10.1021%2fjz101516c&partnerID=40&md5=820e7edd7f04b4e032c6d18523558588 |
| DOI | 10.1021/jz101516c |
| Citation Key | Castiglione2011153 |
