Patent ID: 8257870

Claim:
A non-aqueous electrolyte for a battery comprising: A) a non-aqueous solvent containing 1) a cyclic phosphazene compound represented by the following general formula (I): (NPR 1 2 ) n (I) [wherein R 1 s are independently a halogen element, an alkoxy group or an aryloxy group; and n is 3-4] and 2) a difluorophosphate compound represented by the following general formula (II): [wherein R 2 is an alkyl group, a cycloalkyl group, an alkenyl group, an alkoxy-substituted alkyl group or an aryl group]; B) an aniline derivative represented by the following general formula (III): [wherein R 3 s are independently an alkyl group or an aryl group; R 4 s are independently hydrogen, methyl group, methoxy group or phenyl group] and C) a support salt, wherein a volume ratio of the cyclic phosphazene compound of the general formula (I) to the difluorophosphate compound of the general formula (II) is within a range of 10/90-80/20, a total content of the cyclic phosphazene compound of the general formula (I) and the difluorophosphate compound of the general formula (II) in the non-aqueous solvent is not less than 30% by volume based on the total volume of the non-aqueous solvent, and a content of the aniline derivative of the general formula (III) is 0.01-0.4% by mass based on the whole of the non-aqueous electrolyte for the battery.