NOVELTY - A lithium air battery (300) comprises an anode (117) for intercalating/de-intercalating lithium ions, a cathode (114) comprising oxygen as cathode active material, a lithium ion conductive solid electrolyte membrane (115) formed between the anode and the cathode, and an electrolyte (116). The electrolyte is formed between the lithium ion conductive solid electrolyte membrane and the cathode. The electrolyte comprises compound chosen from heteroaromatic compound (I) and copolymer comprising repeating unit with heteroaromatic structure (II) as an additive.    USE - Lithium air battery is used for electric vehicle.    ADVANTAGE - The lithium air battery has high charge/discharge capacity and improved discharge voltage.    DETAILED DESCRIPTION - A lithium air battery comprises an anode for intercalating/de-intercalating lithium ions, a cathode comprising oxygen as cathode active material, a lithium ion conductive solid electrolyte membrane formed between the anode and the cathode, and an electrolyte. The electrolyte is formed between the lithium ion conductive solid electrolyte membrane and the cathode. The electrolyte comprises compound chosen from heteroaromatic compound of formula (I) and copolymer comprising repeating unit with heteroaromatic structure of formula (II) as an additive.    ring A=6-30C aryl or 3-30C heteroaryl (both optionally substituted);    a=optionally substituted 1-5C alkylenyl;    c=group of formula (a) or (b);    R1-R9=H, halo, nitro, amino, cyano, hydroxy, -C(=O)Ra, -C(=O)ORa, -OCO(ORa), -C=N(Ra), -SRa, -S(=O)Ra, -S(=O)2Ra, -S(=O) 2NHS(=O)2Ra, -P(Ra)2, -P(=O)(Ra)2, or 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 3-30C cycloalkyl, 3-30C cycloalkenyl, 2-30C heterocycloalkyl, 2-30C heterocycloalkenyl, 6-30C aryl, 6-30C aryloxy, 7-30C arylalkyl, 6-30C heteroaryl, 2-30C heteroaryloxy, or 3-30C heteroarylalkyl (all optionally substituted);    Ra=H, 1-10C alkyl, or 6-20C aryl;    t=1-100000;    ring B"=optionally substituted 6-30C aryl or 3-30C heteroaryl;    b=block copolymer;    X=group of formula (c) or (d);    Y'=group of formula (e) or (f);    R10-R18=H, halo, nitro, amino, cyano, hydroxy, -C(=O)Ra1, -C(=O)ORa1, -OCO(ORa1), -C=N(Ra1), -SRa1, -S(=O)Ra1, -S(=O)2Ra1, -S(=O)2NHS(=O)2Ra1, -P(Ra1)2, -P(=O)(Ra1)2, or 1-20C alkyl, 1-20C alkoxy, 2-20C alkenyl, 2-20C alkynyl, 3-30C cycloalkyl, 3-30C cycloalkenyl, 2-30C heterocycloalkyl, 2-30C heterocycloalkenyl, 6-30C aryl, 6-30C aryloxy, 7-30C arylalkyl, 6-30C heteroaryl, 2-30C heteroaryloxy, or 3-30C heteroarylalkyl (all optionally substituted);    Ra1=R1;and    v,u=1-100000.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic structure of lithium air battery.    Cathode (114)    Lithium ion conductive solid electrolyte membrane (115)    Electrolyte (116)    Anode (117)    Lithium air battery (300)