Abstract
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.
Highlights
IntroductionEthyl acetate (EA) shows high relative permittivity (εr = 6.02 at 25 ̊C), but low viscosity (η = 0.426 mPa s at 25 ̊C) [1], as compared to dimethyl carbonate (DMC) (εr = 3.12 and η = 0.63 mPa s at 25 ̊C), ethyl methyl carbonate (EMC) (εr = 2.93 and η = 0.68 mPa s at 25 ̊C), and diethyl carbonate (DEC) (εr = 2.82 and η = 0.75 mPa s at 25 ̊C)
Ethyl acetate is a carboxylate ester of ethanol and acetic acid and is commonly abbreviated to EA or EtOAc
The mass densities and molar concentrations of the linear carboxylates and ethyl methyl carbonate (EMC) decreased with an increase in temperature
Summary
EA shows high relative permittivity (εr = 6.02 at 25 ̊C), but low viscosity (η = 0.426 mPa s at 25 ̊C) [1], as compared to dimethyl carbonate (DMC) (εr = 3.12 and η = 0.63 mPa s at 25 ̊C), ethyl methyl carbonate (EMC) (εr = 2.93 and η = 0.68 mPa s at 25 ̊C), and diethyl carbonate (DEC) (εr = 2.82 and η = 0.75 mPa s at 25 ̊C) These three linear carbonates are commonly used as low-viscosity solvents for lithium-ion batteries [2] [3]. We report the conductivities of electrolyte solutions in 2FEA, EFA, EA, and EMC and their application to lithium secondary batteries
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