Abstract
The Li-O2 battery provides the highest energy density among all rechargeable battery systems. To date, the large over-potentials during the oxygen reduction reaction and oxygen evolution reaction lead to low round-trip efficiency and short cycle life. Herein, we report a Li-O2 battery with outstanding performance. Application of a bi-functional organic catalyst, poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl methacrylate) (PTMA), significantly lowered the charge potential to 3.73 V and increased the discharge potential to 2.75 V. PTMA facilitates both efficient formation and oxidation of Li2O2 through its n- and p-doping ability coupled with superior catalytic activity. Furthermore, PTMA effectively coats the surface of the carbon electrodes, which suppresses side-reactions between carbon and the electrolyte leading to enhanced lifetimes. Figure 1
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