摘要 |
PURPOSE:To enhance the charge and discharge characteristic and low- temperature intense load characteristic of a lithium secondary battery by using as the organic solvent of electrolyte a mixed liquid consisting of propylene carbonate, ethylene carbonate, 2-methyltetrahydrofuran and dimenthylsulfoxide. CONSTITUTION:A mixed liquid consisting of propylene carbonate (PC), ethylene carbonate (EC), 2-methylhydrofuran (2Me-THF) and dimethylsulfoxide (DMSO) is used in the organic solvent of an electrolyte having lithium salts dissolved therein. PC and DMSO are added to the other solvents in an amount of 10 to 45 vol.% and 0.01 to 10 vol.%, respectively, so as to prevent solidification of the EC at low temperatures and crystallization of the lithium salts. This improves the charge and discharge characteristic and low-temperature intense load characteristic of a lithium secondary battery. |