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

Abstract

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 0.05 m LiI, in which the polymer electrolyte efficiently alleviates the Li passivation induced by attacking air. Furthermore, it is demonstrated that I/I2 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.

Eine Sauerstoff atmende Elektrode: Eine an Luft langlebige Lithium‐Luft‐Batterie wurde unter Verwendung eines den Redoxmediator I/I2 enthaltenden Gelpolymerelektrolyts entwickelt (siehe Bild). Das Polymerelektrolyt und der Redoxmediator mindern die durch angreifende Luft hervorgerufene Passivierung des Lithiums und verbessern die Lade‐Entlade‐Effizienz der Batterie.

Authors:   Ziyang Guo, Chao Li, Jingyuan Liu, Yonggang Wang, Yongyao Xia
Journal:   Angewandte Chemie
Year:   2017
Pages:   n/a
DOI:   10.1002/ange.201701290
Publication date:   19-May-2017
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