A new sealed lithium-peroxide battery with a co-doped Li2O cathode in a superconcentrated lithium bis(fluorosulfonyl)amide electrolyte

Abstract

We propose a new sealed battery operating on a redox reaction between an oxide (O 2 ̂') and a peroxide (O 2 2 ̂') with its theoretical specific energy of 2570 €.Wh kg ̂'1 (897 €.mAh g ̂'1, 2.87 €.V) and demonstrate that a Co-doped Li 2 O cathode exhibits a reversible capacity over 190 €.mAh g ̂'1, a high rate capability, and a good cyclability with a superconcentrated lithium bis(fluorosulfonyl)amide electrolyte in acetonitrile. The reversible capacity is largely dominated by the O 2 ̂' /O 2 2 ̂' redox reaction between oxide and peroxide with some contribution of the Co 2+ /Co 3+ redox reaction.