Non-aqueous electrolyte for battery and non-aqueous electrolyte battery comprising the same

1. 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.

2. A non-aqueous electrolyte for a battery according to claim 1 , wherein R 3 in the general formula (III) is methyl group.

3. A non-aqueous electrolyte for a battery according to claim 1 , wherein at least three of R 1 s in the general formula (I) are fluorine.

4. A non-aqueous electrolyte for a battery according to claim 1 , wherein the non-aqueous solvent further contains an aprotic organic solvent.

5. A non-aqueous electrolyte battery comprising a non-aqueous electrolyte for a battery as claimed in any one of claims 1 , 2 , 3 , or 4 , a positive electrode and a negative electrode.