A Long-Life Lithium-Air Battery in Ambient Air with a Polymer Electrolyte Containing a Redox Mediator

作者：Guo, Ziyang; Li, Chao; Liu, Jingyuan; Wang, Yonggang^*; Xia, Yongyao

来源：Angewandte Chemie - International Edition, 2017, 56(26): 7505-7509.

DOI：10.1002/anie.201701290

• electrochemistry
• lithium-air batteries
• oxygen reduction
• polymer electrolytes
• redox mediators

Lithium-air batteries when operated in ambient air generally exhibit poor reversibility and cyclability, because of the Li passivation and Li2O2/LiOH/Li2CO3 accumulation in the air electrode. Herein, we present a Li-air battery supported by a polymer electrolyte containing 0.05M LiI, in which the polymer electrolyte efficiently alleviates the Li passivation induced by attacking air. Furthermore, it is demonstrated that I-/I-2 conversion in polymer electrolyte acts as a redox mediator that facilitates electrochemical decomposition of the discharge products during recharge process. As a result, the Li-air battery can be stably cycled 400 times in ambient air ( relative humidity of 15%), which is much better than previous reports. The achievement offers a hope to develop the Li-air battery that can be operated in ambient air.

• 出版日期2017-6-19
• 单位复旦大学