70411-01-7Relevant academic research and scientific papers
Polar effect of successive fluorination of dimethyl carbonate on physical properties
Nanbu, Noritoshi,Takehara, Masahiro,Watanabe, Susumu,Ue, Makoto,Sasaki, Yukio
, p. 1302 - 1306 (2007)
Successive fluorination of dimethyl carbonate (DMC) exerts a polar effect on various fundamental properties. We describe the temperature dependence of the mass density (ρ), refractive index (nD), relative permittivity (εr), dynamic viscosity (η), and kinematic viscosity (ν) of trifluorinated, difluorinated, and monofluorinated DMCs (TFDMC, DFDMC, and MFDMC, respectively). η decreased in essentially the same order as εr: DFDMC > TFDMC > MFDMC > DMC. However, ν and the boiling point of the TFDMC were lower than those of the MFDMC.
Synthesis of fluorinated dimethyl carbonates by direct fluorination
Takehara, Masahiro,Watanabe, Susumu,Nanbu, Noritoshi,Ue, Makoto,Sasaki, Yukio
, p. 1367 - 1375 (2007/10/03)
Growing interest has been focused on the development of florinated solvents for lithium batteries, because they have a number of benefits such as excellent oxidation durability, wide liquidus ranges, and nonflammability. Flourination of dimethyl carbonate (DMC) is carried out using molecular flourine (15 vol.% F2/N2) at 5°C, and the flourinated derivatives of the DMC are identified and characterized. The selectivity of monoflourinated dimethyl carbonate (MFDMC) is ca. 90% at early stage of the flourination. The successive electrophilic substitution of a hydrogen with a fluorine is found to proceed for the direct fluorination of the DMC.
Physical and electrolytic properties of difluorinated dimethyl carbonate
Sasaki, Yukio,Takehara, Masahiro,Watanabe, Susumu,Nanbu, Noritoshi,Ue, Makoto
, p. 1205 - 1209 (2007/10/03)
The physical and electrolytic properties of difluorinated dimethyl carbonate (DFDMC) synthesized using F2 gas (direct fluorination) were examined. The dielectric constant and viscosity of DFDMC are higher than those of monofluorinated dimethyl carbonate (MFDMC) and dimethyl carbonate (DMC). The oxidative decomposition voltage of DFDMC is higher than those of DMC and MFDMC. The specific conductivity in DFDMC solution is considerably lower than those in MFDMC and DMC solutions. The ethylene carbonate (EC)-DFDMC equimolar binary solution containing 1 mol dm-3 LiPF6 shows a moderate conductivity of 6.91 mS cm-1 at 25 °C. The lithium electrode cycling efficiency (charge-discharge coulombic cycling efficiency of lithium electrode) in EC-DFDMC equimolar binary solution containing 1 mol dm-3 LiPF6 is higher than 80%. The EC-DFDMC solution is a good electrolyte for rechargeable lithium batteries.
