NOVELTY - The battery (1000) has a first electrode part (200) including a lithium metal (210). A second electrode part (300) includes a gas diffusion layer (311) of which one side contacts air, a catalyst layer (312) formed on other side of the gas diffusion layer, a membrane (13) coupled to the catalyst layer and a buffer layer (315) provided between the membrane and the catalyst layer and spaced apart from the first electrode part. An electrolyte part (400) is provided between the electrode parts. A housing part (100) includes a housing (110) provided with a space part having an open upper side.    USE - Lithium air battery for an electric automobile.    ADVANTAGE - The battery prevents a contact between the catalyst layer configuring a cathode of the battery and a large amount of electrolyte to reduce occurrence of overvoltage at time of charging and discharging the battery and suppress evaporation of the electrolyte solution, thus improving durability. The battery allows a polyolefin-based microporous film to be coupled on one side of the gas diffusion layer to suppress a water-based electrolyte, a non-water-based electrolyte and an ionic liquid electrolyte solvent from being evaporated such that even though the charging and discharging of the battery is repeated, so that deterioration in performance of the battery is prevented and lifespan is extended. The battery prevents electric short circuit due to a structure and basically obstruct infiltration of moisture, thus securing excellent cycle lifespan.    DETAILED DESCRIPTION - The buffer layer contains microporous carbon impregnated with conductive ion-exchange resin solution. The membrane is a porous membrane containing sulfonic acid group. The membrane is made of polyperfluorosulfonic acid (PFSA) resin having porous material.    DESCRIPTION OF DRAWING(S) - The drawing shows a cross-sectional view of a lithium air battery.    Membrane (13)    Housing part (100)    Housings (110, 120, 130)    Electrode parts (200, 300)    Lithium metal (210)    Gas diffusion layer (311)    Catalyst layer (312)    Buffer layer (315)    Electrolyte part (400)    Lithium air battery (1000)