A New Sealed Lithium-Peroxide Battery with a Co-Doped Li(2)O Cathode in a Superconcentrated Lithium Bis(fluorosulfonyl)amide Electrolyte

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.