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Towards Reversible and Moisture Tolerant Aprotic Lithium-Air Batteries

preprint
submitted on 30.04.2020, 16:39 and posted on 05.05.2020, 05:03 by Israel Temprano, Tao Liu, Enrico Petrucco, James H. J. Ellison, Gunwoo Kim, Erlendur Jónsson, Clare P. Grey
The development of moisture-tolerant, LiOH-based non-aqueous Li-O2 batteries is a promising route to bypassing the inherent limitations caused by the instability of their typical discharge products, LiO2 and Li2O2. The use of the I-/I3- redox couple to mediate the LiOH-based oxygen reduction and oxidation reactions has proven challenging to develop due to the multiple reaction paths induced by the oxidation of I- on cell charging. In this work we demonstrate a reversible LiOH-based Li-O2 battery cycling through a 4 e-/O2 process with low charging overpotential (below 3.5 V vs Li/Li+) by introducing an ionic liquid to a glyme-based electrolyte containing LiI and water. The addition to the ionic liquid increases the oxidizing power of I3-, shifting the charging mechanism from IO-/IO3- formation to O2 evolution

Funding

Innovate UK (132220)

EPSRC (EP/M009521/1 DJR00640)

History

Email Address of Submitting Author

it251@cam.ac.uk

Institution

University of Cambridge

Country

United Kingdom

ORCID For Submitting Author

0000-0001-5610-8908

Declaration of Conflict of Interest

A version of this article is being under peer review for publication elsewhere.

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