Implications of CO<sub>2</sub> Contamination in Rechargeable Nonaqueous Li–O<sub>2</sub> Batteries


In this Letter, the effect of CO<sub>2</sub> contamination on nonaqueous Li–O<sub>2</sub> battery rechargeability is explored. Although CO<sub>2</sub> contamination was found to increase the cell’s discharge capacity, it also spontaneously reacts with Li<sub>2</sub>O<sub>2</sub> (the primary discharge product of a nonaqueous Li–O<sub>2</sub> battery) to form Li<sub>2</sub>CO<sub>3</sub>. CO<sub>2</sub> evolution from Li<sub>2</sub>CO<sub>3</sub> during battery charging was found to occur only at very high potentials (>4 V) compared to O<sub>2</sub> evolution from Li<sub>2</sub>O<sub>2</sub> (∼3–3.5 V), and as a result, the presence of CO<sub>2</sub> during discharge dramatically reduced the voltaic efficiency of the discharge–charge cycle. These results emphasize the importance of not only completely removing CO<sub>2</sub> from air fed to a Li-air battery, but also developing stable cathodes and electrolytes that will not decompose during battery operation to form carbonate deposits

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This paper was published in FigShare.

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