Journal Article

FZJ-2012-00349

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Limitation of Discharge Capacity and Mechanisms of Air-Electrode Deactivation in Silicon-Air Batteries

Jakes, P. (Corresponding author)FZJ* ; Cohn, G. ; Ein-Eli, Y. ; Scheiba, F. ; Ehrenberg, H. ; Eichel, R.-A.FZJ*

2012
Wiley-VCH Weinheim

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Please use a persistent id in citations: doi:10.1002/cssc.201200199

Abstract: The electrocatalytical process at the air cathode in novel silicon–air batteries using the room-temperature ionic liquid hydrophilic 1-ethyl-3-methylimidazolium oligofluorohydrogenate [EMI⋅2.3 HF⋅F] as electrolyte and highly doped silicon wafers as anodes is investigated by electrochemical means, X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) spectroscopy. The results obtained by XPS and EPR provide a model to describe the limited discharge capacity by means of a mechanism of air-electrode deactivation. In that respect, upon discharge the silicon-air battery′s cathode is not only blocked by silicon oxide reduction products, but also experiences a major modification in the MnO2 catalyst nature. The proposed modification of the MnO2 catalyst by means of a MnF2 surface layer greatly impacts the Si–air performance and describes a mechanism relevant for other metal–air batteries, such as the lithium–air. Moreover, the ability for this deactivation layer to form is greatly impacted by water in the electrolyte.

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Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 152 - Renewable Energies (POF2-152) (POF2-152)

Appears in the scientific report 2012

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Database coverage:
; JCR ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection ; Zoological Record

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