Nonaqueous electrolyte battery

A nonaqueous electrolyte battery comprising:

• a positive electrode,
• a negative electrode, and
• a nonaqueous electrolyte, wherein
• the positive electrode contains, as a positive electrode active material, a positive electrode material having a surface composition represented by the following formula (I);
• the nonaqueous electrolyte contains a halogenated carbonate represented by any of the following formulae (1) to (2) and an alkylbenzene represented by the following formula (3);
• a content of the halogenated carbonate is 0.1% by mass or more and not more than 50% by mass relative to the nonaqueous electrolyte;
• and
• a content of the alkylbenzene is 0.1% by mass or more and not more than 5% by mass relative to the nonaqueous electrolyte
• LipNi(1-q-r)M1qM2rO(2-y)Xz (I)
• wherein
• each of M1 and M2 represents at least one member selected from the group consisting of elements of the groups 2 to 15 other than nickel (Ni);
• X represents at least one member selected from the group consisting of elements of the groups 16 and 17 other than oxygen (O);
• p, q, r, y and z are values falling within the ranges of (0≦p≦1.5), (O≦q≦1.0), (0≦r≦1.0), (−0.10≦y≦0.20) and (0≦z≦0.2), respectively;
• and (q+r) is less than 1,
• wherein
• each of R21 to R26 independently represents a hydrogen group, a halogen group, an alkyl group or a halogenated alkyl group, provided that at least one of R21 to R26 is a halogen group or a halogenated alkyl group,
• wherein
• each of R27 to R30 independently represents a hydrogen group, a halogen group, an alkyl group or a halogenated alkyl group, provided that at least one of R27 to R30 is a halogen group or a halogenated alkyl group, and
• wherein
• each of R1 to R3 independently represents an alkyl group or an aryl group;
• R1 to R3 may be bonded to each other to form a ring;
• and a part of hydrogen in each of R1 to R3 may be substituted with a halogen.