Implications of CO2 Contamination in Rechargeable Nonaqueous Li-O2 Batteries
Implications of CO2 Contamination in Rechargeable Nonaqueous Li-O2 Batteries
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DOI：
10.1021/jz301902h
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发表时间：
2013-01-17
影响因子：
5.7
通讯作者：
McCloskey, B. D.
中科院分区：
文献类型：
--
作者：
Gowda, S. R.;Brunet, A.;McCloskey, B. D.
本文探讨了CO2污染对非水Li-O-2电池可充性的影响。虽然发现二氧化碳污染会增加电池的放电容量，但它也会自发地与Li2O2(非水Li-O-2电池的初级放电产物)反应生成Li2CO3。与从Li2O2放出O2(类似于3-3.5V)相比，在电池充电过程中从Li2CO3放出二氧化碳仅在非常高的电位(>；4V)下发生，因此，放电过程中存在的CO2显著降低了放电-充电循环的伏安效率。这些结果强调，不仅要完全消除锂空气电池空气中的二氧化碳，而且要开发稳定的阴极和电解液，这些阴极和电解液在电池运行期间不会分解形成碳酸盐沉积物。
In this Letter, the effect of CO2 contamination on nonaqueous Li-O-2 battery rechargeability is explored. Although CO2 contamination was found to increase the cell's discharge capacity, it also spontaneously reacts with Li2O2 (the primary discharge product of a nonaqueous Li-O-2 battery) to form Li2CO3. CO2 evolution from Li2CO3 during battery charging was found to occur only at very high potentials (>4 V) compared to O-2 evolution from Li2O2 (similar to 3-3.5 V), and as a result, the presence of CO2 during discharge dramatically reduced the voltaic efficiency of the discharge-charge cycle. These results emphasize the importance of not only completely removing CO2 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.