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7757057 
Journal Article 
The effect of ethylene carbonate and salt concentration on the conductivity of propylene carbonate vertical bar lithium perchlorate electrolytes 
Chen, HP; Fergus, JW; Jang, BZ 
2000 
1 
Journal of Electrochemical Society
ISSN: 0013-4651
EISSN: 1945-7111 
Electrochemical Society Inc. 
147 
2 
399-406 
English 
WOS:000085294400002 
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 (LiClO4) salt concentration and EC/PC molar ratio have been studied. The highest conductivity, 1.4 × 10-2 S cm-1, occurs when the salt concentration is about 1 mol L-1 and the EC/PC molar ratio is about one. To understand the composition dependence of the conductivity, the interaction between Li+ and EC molecule has been studied using Raman spectroscopy. These results showed that the solvation number of Li+ increases with increasing the EC/PC molar ratio at constant LiClO4 concentration and the solvation number of Li+ decreases with increasing the LiClO4 concentration at constant EC/PC molar ratio. © 2000 The Electrochemical Society. All rights reserved.