| abstract |
Provided are a nonaqueous electrolyte solution of an electrolyte salt dissolved in a nonaqueous solvent, wherein the nonaqueous electrolyte solution is characterized in that the nonaqueous solvent includes a cyclic carbonate and a linear carbonate satisfying the following condition 1 or 2, and the nonaqueous electrolyte solution contains vinyl sulfonyl fluoride at a level of 0.001-5 mass%; and an electrical storage device employing the same. Condition 1: the linear carbonate includes both a symmetric linear carbonate and a assymmetric linear carbonate, the proportion of the assymmetric linear carbonate in the linear carbonate being 51-95 vol%. Condition 2: Includes ethylene carbonate and propylene carbonate as the cyclic carbonates, and a symmetric linear carbonate as the linear carbonate. This nonaqueous electrolyte solution can improve the electrochemical properties when the electrical storage device is used at high voltage, and further improve the discharge capacity maintenance rate subsequent to a high voltage cycle, and can also inhibit production of gases. |