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The effect of O2 concentration on the reaction mechanism in Li-O2 batteries
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology, Applied Electrochemistry.
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2017 (English)In: Journal of Electroanalytical Chemistry, ISSN 0022-0728, E-ISSN 1873-2569, Vol. 797, 1-7 p.Article in journal (Refereed) Published
Abstract [en]

The promising lithium-oxygen battery chemistry presents a set of challenges that need to be solved if commercialization is ever to be realized. This study focuses on how the O2 reaction path is effected by the O2 concentration in the electrolyte. An electrochemical quartz crystal microbalance system was used to measure current, potential, and change in electrode mass simultaneously. It is concluded that the mass reversibility is O2 concentration dependent while the coulombic efficiency is not. The mass reversibility is higher at low O2 concentration meaning that more of the deposited Li2O2 is removed during oxidation in relation to the amount deposited during reduction. The first step of the reduction is the formation of soluble LiO2, which is then either reacting further at the electrode or being transported away from the electrode resulting in low current efficiency and low deposited mass per electrons transferred. During the oxidation, the first step involves de-lithiation of Li2O2 at low potential followed by bulk oxidation. The oxidation behavior is O2 concentration dependent, and this dependence is likely indirect as the O2 concentration effects the amount of discharge product formed during the reduction. The O2 concentration at different saturation pressures was determined using a mass spectrometer. It was found that the electrolyte follows Henry's law at the pressures used in the study. In conclusion, this study provides insight to the O2 concentration dependence and the preferred path of the O2 electrochemical reactions in lithium-oxygen batteries.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 797, 1-7 p.
Keyword [en]
Atomic force microscope, Electrochemical quartz crystal microbalance, Mass spectrometer, Non-aqueous lithium-oxygen battery, O2 concentration dependence, O2 saturation concentration, Reaction mechanism
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-209523DOI: 10.1016/j.jelechem.2017.05.005Scopus ID: 2-s2.0-85019102835OAI: oai:DiVA.org:kth-209523DiVA: diva2:1112634
Funder
Swedish Foundation for Strategic Research , EM11-0028
Note

QC 20170620

Available from: 2017-06-20 Created: 2017-06-20 Last updated: 2017-06-20Bibliographically approved

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