| 摘要 |
PROBLEM TO BE SOLVED: To restrain self-discharge when a battery is preserved, and to improve a preserving characteristic by including dioxolane in an organic solvent containing isoxazole, oxazole, oxazoline and their derivatives. SOLUTION: At least one kind selected from 3,5-dimethyl isoxazole, oxazole and 2-methyl-2-oxazoline is added as an additive to an organic solvent containing dioxolane >=10 wt.%. When a nonaqueous electrolyte composed of this organic solvent and a solute is used, the additive reacts with lithium is the presence of dioxolane to form a good quality coating film on a negative electrode. Since this coating film restrains direct contact of lithium with the organic solvent, the decomposition of the nonaqueous electrolyte is restrained. An adding quantity of the additive is set to the range of about 0.01 to 30.0%, particularly desirably, 0.1 to 20.0% to the weight of the organic solvent. An electrode material to store/release lithium ions or metallic lithium can be exemplified as the negative electrode of a battery. |
