Patent ID: 6794089
Filing Date: 2004-09-21
Classification: H01M,Y02E,Y02P

Abstract:
A nonaqueous electrolyte comprising a nonaqueous solvent and a solute dissolved in said nonaqueous solvent, wherein:said nonaqueous solvent contains ethylene carbonate (EC), propylene carbonate (PC), &ggr;-butyrolactone (BL), and a fourth component which includes at least one solvent selected from the group consisting of vinylene carbonate, vinylethylene carbonate, ethylene sulfite, phenylethylene carbonate, 12-crown-4 and tetraethylene glycol dimethyl ether; and the mixing ratio x (% by volume) of ethylene carbonate based on the total amount of the nonaqueous solvent falls within a range of 15 to 50, the mixing ratio y (% by volume) of propylene carbonate based on the total amount of the nonaqueous solvent falls within a range of larger than 10 and not larger than 35, the mixing ratio z (% by volume) of &ggr;-butyrolactone based on the total amount of the nonaqueous solvent falls within a range of 30 to 85, and the mixing ratio p (% by volume) of said fourth component based on the total amount of the nonaqueous solvent is larger than 0 and is not larger than 5.