Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 121, Issue 21, Pages 11178-11183Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.7b03306
Keywords
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Funding
- U.S. Army Research Laboratory
- Energy Efficiency and Renewable Energy, Office of Vehicle Technologies of the U.S. Department of Energy (DOE) under the Advanced Battery Materials Research (BMR) Program [DE-AC02-05CH11231, 6951379]
- DOE [DE-AC05-76RLO1830]
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Electrolytes of 1 M LiPF6 (lithium hexafluorophosphate) and 0.05 M CsPF6 (cesium hexafluorophosphate) in EC-PC-EMC (ethylene carbonate-propylene carbonate ethyl methyl carbonate) solvents of varying solvent compositions were studied for the effects of solvent composition on the lower limit of liquid range, glass transition temperature (as a reflection of viscosity), and electrolytic conductivity. In addition, a ternary phase diagram of EC-PC-EMC was constructed, and crystallization temperatures of EC and EMC were calculated to assist the interpretation and understanding of the change of liquid range with solvent composition. A function based on the Vogel-Fulcher-Tammann equation was fitted to the conductivity data in their entirety and was plotted as conductivity surfaces in solvent composition space for more direct and clear comparisons and discussions. Changes of viscosity and dielectric constant of the solvents with their composition, in relation to those of the solvent components, were found to be underlying many of the processes studied.
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