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A Long‐Life Lithium–Air Battery in Ambient Air with a Polymer Electrolyte Containing a Redox Mediator
Author(s) -
Guo Ziyang,
Li Chao,
Liu Jingyuan,
Wang Yonggang,
Xia Yongyao
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201701290
Subject(s) - electrolyte , passivation , battery (electricity) , polymer , materials science , electrochemistry , relative humidity , lithium (medication) , chemical engineering , electrode , chemistry , nanotechnology , composite material , layer (electronics) , medicine , power (physics) , physics , quantum mechanics , endocrinology , engineering , thermodynamics
Lithium–air batteries when operated in ambient air generally exhibit poor reversibility and cyclability, because of the Li passivation and Li 2 O 2 /LiOH/Li 2 CO 3 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 − /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.