The high theoretical energy densities of lithium-air batteries (LAB) make this technology an attractive energy storage system for future mobility applications. Li₂O₂ growth process on the cathode relies on the surrounding chemical environment of electrolytes. Low conductivity and strong reactivity of Li₂O₂ discharge products can cause overpotential and induce side reactions in LABs, respectively, eventually leading to poor cyclability. The capacity and reversibility of LABs are highly susceptible to the morphology of the Li₂O₂ discharge products. Here, we identify for the first time that a seed layer formed by the combination of a cathode and an electrolyte determines the morphology of Li₂O₂ discharge products. This seed layer led to its high reversibility with a large areal capacity (up to 10 mAh/cm²). Excellent OER (oxygen evolution reaction) was achieved by the formation of a favorable interface between the carbon …