NOVELTY - An electrolyte comprises a lithium salt, a non-aqueous organic solvent, and an additive having a benzazole-based compound.    USE - As an electrolyte for used in lithium secondary battery (claimed) which is used in an electric vehicle.    ADVANTAGE - The electrolyte provides lithium secondary batteries having excellent high temperature life characteristics and high temperature conservation characteristics, and improved life time characteristics.    DETAILED DESCRIPTION - An electrolyte comprises a lithium salt, a non-aqueous organic solvent, and an additive having a benzazole-based compound of formula (I).    A1-A9=groups of formulae (i)-(iv);    P'=3-6C aromatic ring;    Q'=3-5C aromatic or non-aromatic ring;    B1 and B2=single bond, -C(=O)-, 1-5C alkylene group;    R1 and R2=1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 2-20C alkylene oxide, 3-30C cycloalkyl, 6-30C aryl, 6-30C aryloxy, 6-30C heteroaryl (all optionally substituted), H, halo, cyano, hydroxyl, -C(=O)R'a, -C(=O)OR'a, -OCO(OR'a), -C=N(R'a), -SR'a, -S(=O)R'a, -S(=O)2R'a, or -PR'a;    R'a=H, 1-10 alkyl, or 6-20C aryl.    Provided that:    (1) A1-A9 includes at least one of compound (iii) and (iv); and    (2) at least one of R1 and R2 includes 1-20C alkoxy, 2-20C alkylene oxide, 6-30C aryloxy or 6-30C heteroaryl group (all optionally substituted), or polar functional group selected from halo, hydroxyl, -C(=O)R'a, -C(=O)OR'a, -OCO(OR'a), C=N(R'a), -SR'a, or -PR'a.    An INDEPENDENT CLAIM is included for a lithium secondary battery comprising a positive electrode having a positive active material into or from which lithium ions are intercalated or deintercalated; a negative electrode having a negative active material into or from which lithium ions are intercalated or deintercalated; and the electrolyte interposed between the positive electrode and the negative electrode.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram illustrating a solid electrolyte interface (SEI) film formed at the surface of the positive electrode, when an additive for a lithium secondary battery is added to the electrolyte.    Current collector (20)    Positive active material (22)    Lithium ions (24)    SEI film (26)    Electrolyte (28)