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Progress to lithium-oxygen batteries with up to four times the energy density of lithium-ion
The high theoretical-energy density of lithium-oxygen (Li-O2) batteries and their relatively light weight have made them the Holy Grail of rechargeable battery systems. But long-standing issues with the battery's chemistry and stability have kept them a purely academic curiosity.
Two of the more serious issues involve the intermediate of the cell chemistry (superoxide, LiO2) and the peroxide product (Li2O2) reacting with the porous carbon cathode, degrading the cell from within. In addition, the superoxide consumes the organic electrolyte in the process, which greatly limits the cycle life.