| 摘要 |
PURPOSE:To improve the charge/discharge cycle characteristic by using a nonaqueous electrolyte solved with LiCF3SO3 in a mixed solvent containing at least two kinds of high-boiling point solvents. CONSTITUTION:A nonaqueous electrolyte solved with LiCF3SO3 in a mixed solvent containing at least two kinds of high-boiling point solvents is used. The decomposition of the electrolyte is suppressed even in the strong oxidizing atmosphere because of the large oxidation resistance of CF3S3. A mixed solvent of at least two kinds of cyclic carbonate or at least one kind of cyclic carbonate and gamma-butyrolactone or sulfolane is used for the mixed solvent containing at least two kinds of high-boiling point solvents, and one kind selected from a group of ethylene carbonate, propylene carbonate and butylene carbonate is used for the carbonate. The reaction hindrance of lithium is thereby suppressed, and the cycle characteristic can be improved. |
