| 摘要 |
PROBLEM TO BE SOLVED: To improve the charge and discharge efficiency of a lithium negative electrode, by increasing the number of cycle which can be charged and discharged, while maintaining a high voltage and a high energy density. SOLUTION: To 1mol/1 of LiPF6 /EC+DEC of a standard nonaqueous electrolyte which is made by dissolving a solute of lithium salt consisting of lithium hexafluorophosphate (LiPF6 ) into an organic solvent made by mixing ethylene carbonate(EC) and diechylene carbonate(DEC) at the ratio 1:1, an adequate amount of acetoamide or an acetoamide derivative is added as an additive, so as to make a nonaqueous electrolyte for a lithium secondary battery having a lithium negative electrode. Consequently, a lithium secondary battery having a long service life of the cycle allowable to charge and discharge, and a good charge and discharge efficiency, can be realized. |
