The effect of ethylene carbonate and salt concentration on the conductivity of propylene carbonate{vert_bar}lithium perchlorate electrolytes

Journal Article · Tue Feb 01 04:00:00 EST 2000 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.1393209· OSTI ID:20023325

Chen, H P; Fergus, J W; Jang, B Z

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, Journal Name: Journal of the Electrochemical Society Journal Issue: 2 Vol. 147; ISSN JESOAN; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
36 MATERIALS SCIENCE
CARBONIC ACID ESTERS
ELECTRIC CONDUCTIVITY
ELECTROLYTES
LITHIUM PERCHLORATES