| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a secondary battery capable of obtaining superior cycle characteristic, load characteristic, bulge characteristic and security. <P>SOLUTION: A positive electrode 21 and anode 22 are provided together with an electrolyte solution, while a separator 23 provided between the positive electrode 21 and the anode 22 is impregnated with an electrolyte solution. The solvents of the electrolyte solution include: a first solvent of ethylene carbonate or the like, a second solvent of diethyl carbonate or the like, a third solvent of 4,5-difluoro-1,3-dioxolane, and a fourth solvent of 4-fluoro-1,3-dioxolane or the like. The content of the respective solvents is as follows: the first solvent having 5% or more of the weight and 45% of the weight or less; the second solvent having 40% of the weight or more and 70% of the weight or less; the third solvent having 1% of the weight or more and 15% of the weight or less; the fourth solvent having 3% of the weight or more and 24% of the weight or less; the total of the third and fourth solvents having 4% of the weight or more and 25% of the weight or less. <P>COPYRIGHT: (C)2009,JPO&INPIT |
