Author(s)

Noritoshi Nambu^*, Yukio Sasaki

Department of Life Science and Sustainable Chemistry, Faculty of Engineering, Tokyo Polytechnic University, Atsugi, Kanagawa, Japan.

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.

Monofluorinated Organic Solvent, Carboxylate, Position Isomerism, Electrolytic Properties, Discharge Capacity, Lithium Secondary Battery

Nambu, N. and Sasaki, Y. (2015) Physical and Electrolytic Properties of Monofluorinated Ethyl Acetates and Their Application to Lithium Secondary Batteries. Open Journal of Metal, 5, 1-9. doi: 10.4236/ojmetal.2015.51001.