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The rechargeable aprotic Li-air (O2) battery is a promising potentialtechnology for next generation energy storage, but its practical realizationstill faces many challenges. In contrast to the standard Li-O2 cells, whichcycle via the formation of Li2O2, we use a reduced graphene oxide electrode,the additive LiI, and the solvent dimethoxyethane to reversibly form/removecrystalline LiOH with particle sizes > 15 um during discharge/charge. Thisleads to high specific capacities, excellent energy efficiency (93.2%) with avoltage gap of only 0.2 V, and impressive rechargeability. The cells toleratehigh concentrations of water, water being the dominant proton source for theLiOH; together with LiI it has a decisive impact on the chemical nature of thedischarge product and battery performance.

Cycling Li-O2 Batteries via LiOH Formation and Decomposition