An Advanced Li–O2 Battery with Ultrahigh Power and Energy Density

Li–O 2 batteries have great potential for advanced energy storage systems because of their high theoretical energy density. However, the difficulties in fully achieving their theoretical capacity and the poor power output of current Li–O 2 batteries has restricted their use in propulsion applications. In this work, we demonstrated a combination of a functionalized carbon electrode with screening ether-based electrolyte. High capacity, rate performances, and cycle stabilities could be achieved in the Li–O 2 cell by applying a functionalized carbon cathode with 1 M LiTFSI-DME electrolyte. Using electrochemical impedance spectroscopy, we confirmed that the O 2 diffusion/transport-related term is a decisive factor for high performance Li–O 2 batteries.