Lithium-oxygen (air) has one of the largest theoretical energy densities of any practical electrochemical couple. This paper discusses the architecture of an advanced Li-air cathode with an average voltage of 2.33 V and a gravimetric capacity of 5813 mAh/g of carbon, achieved at (i) a current density of 0.1 mA/cm(2) and (ii) without the use of catalysts.