RAMAN AND NMR ANALYSIS OF LICLO4 CONCENTRATED-SOLUTIONS IN ETHYLENE CARBONATE PROPYLENE CARBONATE

Authors
CAZZANELLI E MUSTARELLI P BENEVELLI F APPETECCHI GB CROCE F
Citation
E. Cazzanelli et al., RAMAN AND NMR ANALYSIS OF LICLO4 CONCENTRATED-SOLUTIONS IN ETHYLENE CARBONATE PROPYLENE CARBONATE, Solid state ionics, 86-8, 1996, pp. 379-384
Citations number
17
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical
Journal title
Solid state ionics → ACNP
ISSN journal
01672738
Volume
86-8
Year of publication
1996
Part
1
Pages
379 - 384
Database
ISI
SICI code
0167-2738(1996)86-8:<379:RANAOL>2.0.ZU;2-Z
Abstract
A comparative Raman and C-13-NMR study has been performed on LiClO4 co ncentrated solutions in ethylene carbonate (EC)-propylene carbonate (P C), which are of interest for electrochemical devices like secondary l ithium batteries. A phase transition has been detected near a ratio N = [Li+]/[EC + PC] congruent to 0.5. Below this threshold, Li+ ions are relatively free to move and are solvated by EC and PC with a coordina tion number, n, which approaches similar to 2. In more concentrated so lutions the cations seem to form a complex by ''sandwiching'' an EC an d a PC molecule.