TY - JOUR AB - The rechargeable nonaqueous lithium-air (Li-O2) battery is receiving a great deal of interest because, theoretically, its specific energy far exceeds the best that can be achieved with lithium-ion cells. Operation of the rechargeable Li-O2 battery depends critically on repeated and highly reversible formation/decomposition of lithium peroxide (Li2O2) at the cathode upon cycling. Here, we show that this process is possible with the use of a dimethyl sulfoxide electrolyte and a porous gold electrode (95% capacity retention from cycles 1 to 100), whereas previously only partial Li2O2 formation/decomposition and limited cycling could occur. Furthermore, we present data indicating that the kinetics of Li2O2 oxidation on charge is approximately 10 times faster than on carbon electrodes. AU - Peng, Z. AU - Freunberger, Stefan Alexander AU - Chen, Y. AU - Bruce, P. G. ID - 7310 IS - 6094 JF - Science SN - 0036-8075 TI - A reversible and higher-rate Li-O2 battery VL - 337 ER -