| abstract |
The nonaqueous electrolyte for secondary batteries includes a nonaqueous solvent and lithium salt dissolved in the nonaqueous solvent, and the nonaqueous solvent includes fluorine-containing cyclic carbonate, propylene carbonate, and diethyl carbonate. The content W FCC of the fluorine-containing cyclic carbonate is 2 to 12% by mass, the content W PC of the propylene carbonate is 40 to 70% by mass, and the content W DEC of the diethyl carbonate is 20 to 50% by mass. The ethylene carbonate content in the said non-aqueous solvent may be 5 mass% or less. |