| abstract |
As a nonaqueous electrolyte including a nonaqueous solvent and a solute dissolved in the nonaqueous solvent, the nonaqueous solvent contains ethylene carbonate, propylene carbonate, diethyl carbonate, and a first additive, and ethylene carbonate, propylene carbonate, and diethyl carbonate. the weight ratio W of the PC propylene carbonate, the total amount is 30 to 60% by weight, the weight ratio W of the non-PC of the propylene carbonate relative to the weight ratio of ethylene carbonate EC W occupied by the sum of: the PC W / W EC, 2.25 ≤ W PC / W EC ≤ 6, wherein the first additive contains at least one of unsaturated sultone and sulfonic acid ester, and further comprises 0.1 to 3% by weight of the total nonaqueous electrolyte. |