Temperature Dependence of the Oxygen Reduction Mechanism in Nonaqueous Li-O2 Batteries
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- Temperature Dependence of the Oxygen Reduction Mechanism in Nonaqueous Li-O2 Batteries
- Liu, Bin; Xu, Wu; Zheng, Jianming; Yan, Pengfei; Walter, Eric D.; Isern, Nancy; Bowden, Mark E.; Engelhard, Mark H.; Kim, Sun Tai; Read, Jdffrey; Adams, Brian D.; Li, Xiaolin; Cho, Jaephil; Wang, Chongmin; Zhang, Ji-Guang
- Issue Date
- AMER CHEMICAL SOC
- ACS ENERGY LETTERS, v.2, no.11, pp.2525 - 2530
- The temperature dependence of the oxygen reduction mechanism in nonaqueous Li-O2 batteries is investigated within the temperature range of -20 to 40 °C. The discharge capacity of the Li-O2 battery first decreases from 7492 mAh g-1 at 40 °C to 2930 mAh g-1 at 0 °C and then increases sharply with a further decrease in temperature and reaches a very high capacity of 17 716 mAh g-1 at -20 °C at 0.1 mA cm-2. The lifetime of superoxide intermediates and the solution pathway were found to play a dominant role in the discharge of the Li-O2 battery 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-O2 batteries between 0 and 40 °C. This work will broaden the fundamental understanding of the oxygen reduction process in the Li-O2 battery, especially at different temperatures.
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