Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 4, Issue 17, Pages 2989-2993Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz401659f
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Li-air batteries have generated enormous interest as potential high specific energy alternatives to existing energy storage devices. However, Li-air batteries suffer from poor rechargeability caused by the instability of organic electrolytes and carbon cathodes. To understand and address this poor rechargeability it is essential to elucidate the efficiency in which O-2 is converted to Li2O2 (the desired discharge product) during discharge and the efficiency in which Li2O2 is oxidized back to O-2 during charge. In this Letter, we combine many quantitative techniques, including a newly developed peroxide titration to assign and quantify decomposition pathways occurring in cells employing a variety of solvents and cathodes. We find that Li2O2-induced electrolyte solvent and salt instabilities account for nearly all efficiency losses upon discharge, whereas both cathode and electrolyte instabilities are observed upon charge at high potentials.
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