Physical and Electrolytic Properties of Monofluorinated Ethyl Acetates and Their Application to Lithium Secondary Batteries

Autor:	Noritoshi Nambu, Yukio Sasaki
Rok vydání:	2015
Předmět:	chemistry.chemical_compound Viscosity chemistry Inorganic chemistry Ethyl acetate Polar effect Relative permittivity chemistry.chemical_element Lithium Electrolyte Conductivity Electrochemistry
Zdroj:	Open Journal of Metal. :1-9
ISSN:	2164-277X 2164-2761
DOI:	10.4236/ojmetal.2015.51001
Popis:	Ethyl acetate (EA) shows low viscosity for its relative permittivity. Monofluorinated organic solvents exert the polar effect on the various properties. We have investigated the effect of position isomerism on the physical and electrochemical properties of two monofluorinated carboxylates: 2-fluoroethyl acetate (2FEA) and ethyl fluoroacetate (EFA). Relative permittivity of 2FEA was lower than that of EFA, whereas viscosity of 2FEA was higher. Electrolytic conductivity of a LiPF6 solution in 2FEA was lower than that in EFA, but higher than that in EA at high temperatures. The use of 2FEA as a co-solvent improved cycling efficiency and suppressed fading of discharge capacity of a Li|LiCoO2 coin cell at high cycle numbers.
Databáze:	OpenAIRE
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