Issue 29, 2019

Killing two birds with one stone: a Cu ion redox mediator for a non-aqueous Li–O2 battery

Abstract

The aprotic Li–O2 battery is considered as a promising high-energy storage system although its practical application is limited by high overpotential and parasitic reactions. Herein, it is shown that by the addition of a soluble Cu ion, the electrochemistry of Li2O2 for both discharge and charge processes can be mediated by different redox couples of the Cu ion. The improved capacity was achieved by a Cu+/Cu0 redox-mediated reaction pathway, and the 3.6 V Cu+/Cu2+ redox couple helped reduce the charge overpotential. Moreover, because of the suppression of the reactive superoxide intermediate and a mild charge potential, the parasitic reaction was effectively inhibited. Not rigidly limited within the organic compound candidates, the introduction of the inorganic Cu ion, as a multi-functional mobile additive, would open up a new pathway for the design of metal-ion redox mediators for Li–O2 batteries.

Graphical abstract: Killing two birds with one stone: a Cu ion redox mediator for a non-aqueous Li–O2 battery

Supplementary files

Article information

Article type
Communication
Submitted
12 May 2019
Accepted
26 Jun 2019
First published
26 Jun 2019

J. Mater. Chem. A, 2019,7, 17261-17265

Author version available

Killing two birds with one stone: a Cu ion redox mediator for a non-aqueous Li–O2 battery

H. Deng, Y. Qiao, X. Zhang, F. Qiu, Z. Chang, P. He and H. Zhou, J. Mater. Chem. A, 2019, 7, 17261 DOI: 10.1039/C9TA04946K

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