Temperature Dependence of the Oxygen Reduction Mechanism in Nonaqueous Li–O 2 Batteries
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ACS Energy Letters, ISSN: 2380-8195, Vol: 2, Issue: 11, Page: 2525-2530
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- Chemistry; Energy; Materials Science
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The temperature dependence of the oxygen reduction mechanism in nonaqueous Li-Obatteries is investigated within the temperature range of -20 to 40 °C. The discharge capacity of the Li-Obattery first decreases from 7492 mAh gat 40 °C to 2930 mAh gat 0 °C and then increases sharply with a further decrease in temperature and reaches a very high capacity of 17 716 mAh gat -20 °C at 0.1 mA cm. The lifetime of superoxide intermediates and the solution pathway were found to play a dominant role in the discharge of the Li-Obattery in the temperature range of -20 to 0 °C, but the electrochemical kinetics of oxygen reduction and the surface pathway dominate the discharge behavior of the Li-Obatteries between 0 and 40 °C. This work will broaden the fundamental understanding of the oxygen reduction process in the Li-Obattery, especially at different temperatures.