| abstract |
Monofluoromethylethylene carbonate, difluoromethylethylene carbonate and trifluoromethylethylene carbonate, each being a novel compound that is chemically and physically stable, has a high permittivity, can well dissolve organic substances, and can be used in a wide temperature range, thus being useful as a solvent. Further these compounds are excellent in withstand voltage and charge-discharge cycle characteristics as a nonaqueous electrolyte solution, have a high flashing point and an excellent safety, and can provide batteries excellent in withstand voltage and charge-discharge cycle characteristics. |