A Li–O2/CO2batteryElectronic supplementary information (ESI) available: Experimental details, additional characterization and battery performance. See DOI: 10.1039/c0cc05176d.

A new gas-utilizing battery using mixed gas of O2and CO2was developed and proved its very high discharge capacity. The capacity reached three times as much as that of a non-aqueous Li–air (O2) battery. The unique point of the battery is expected to be the rapid consumption of superoxide anion radical by CO2as well as the slow filling property of the Li2CO3in the cathode. [ABSTRACT FROM AUTHOR]