The effect of ethylene carbonate and salt concentration on the conductivity of propylene carbonate{vert_bar}lithium perchlorate electrolytes
Propylene carbonate (PC) is a common organic solvent used in lithium batteries due to its high dielectric constant and high chemical stability with lithium. However, the conductivity of PC-based electrolytes is about two orders of magnitude lower than those of aqueous electrolytes. To increase the conductivity of PC-based electrolytes, a co-solvent, ethylene carbonate (EC), is added to the electrolyte to form a mixed solvent. In this research, the conductivity of electrolytes as a function of lithium perchlorate (LiClO{sub 4}) salt concentration and EC/PC molar ratio have been studied. The highest conductivity, 1.4 x 10{sup {minus}2} S/cm, occurs when the salt concentration is about 1 mol/L and the EC/PC molar ratio is about one. To understand the composition dependence of the conductivity, the interaction between Li{sup +} and EC molecule has been studied using Raman spectroscopy. These results showed that the solvation number of Li{sup +} increases with increasing the EC/PC molar ratio at constant LiClO{sub 4} concentration and the solvation number of Li{sup +} decreases with increasing the LiClO{sub 4} concentration at constant EC/PC molar ratio.
- Research Organization:
- Auburn Univ., AL (US)
- OSTI ID:
- 20023325
- Journal Information:
- Journal of the Electrochemical Society, Vol. 147, Issue 2; Other Information: PBD: Feb 2000; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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