Dialkyl ethers show high relative permittivities and low viscosities as compared to the corresponding linear carbonates. We have synthesized 1-(2-fluoroethoxy)-2-(2,2,2-trifluoroethoxy)ethane (FETFEE). The relative permittivity and viscosity of FETFEE were higher than those of 1,2-diethoxyethane (DEE, ethylene glycol diethyl ether). The conductivity of 1 mol dm−3 LiPF6 solution in FETFEE was higher than that in 1-ethoxy-2-(2,2,2-trifluoroethoxy)ethane (ETFEE). The use of FETFEE as a co-solvent improved the discharge capacity of a Li | LiCoO2 coin cell.
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Nambu et al. (2016) studied this question.
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