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Issue 6, 2013
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Current density dependence of peroxide formation in the Li–O2 battery and its effect on charge

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Abstract

We report a significant difference in the growth mechanism of Li2O2 in Li–O2 batteries for toroidal and thin-film morphologies which is dependent on the current rate that governs the electrochemical pathway. Evidence from diffraction, electrochemical, FESEM and STEM measurements shows that slower current densities favor aggregation of lithium peroxide nanocrystallites nucleated via solution dismutase on the surface of the electrode; whereas fast rates deposit quasi-amorphous thin films. The latter provide a lower overpotential on charge due to their nature and close contact with the conductive electrode surface, albeit at the expense of lower discharge capacity.

Graphical abstract: Current density dependence of peroxide formation in the Li–O2 battery and its effect on charge

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Supplementary files

Article information


Submitted
28 Feb 2013
Accepted
25 Apr 2013
First published
25 Apr 2013

Energy Environ. Sci., 2013,6, 1772-1778
Article type
Communication

Current density dependence of peroxide formation in the Li–O2 battery and its effect on charge

B. D. Adams, C. Radtke, R. Black, M. L. Trudeau, K. Zaghib and L. F. Nazar, Energy Environ. Sci., 2013, 6, 1772
DOI: 10.1039/C3EE40697K

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