| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve charge/discharge characteristics of a nonaqueous electrolyte solution secondary battery equipped with a positive electrode containing a positive electrode active material, a negative electrode containing a carbon material as a negative electrode active material, and nonaqueous electrolytic solution containing a solvent and solute and using sulfolane as a solvent of the nonaqueous electrolytic solution. <P>SOLUTION: Both vinylethylene carbonate and vinylene carbonate or its derivative are added to the nonaqueous electrolytic solution containing sulfolane as the solvent. It is preferable that the sulfolane is contained in the solvent by 15 volume percent or more, and the vinylethylene carbonate and the vinylene carbonate or its derivative are added by 0.1 to 5 weight parts to 100 weight parts of the nonaqueous electrolytic solution. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
