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Li Salt Anion Effect on O-2 Solubility in an Li-O-2 Battery
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry. (Tillämpad elektrokemi)ORCID iD: 0000-0001-7539-0304
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Applied Electrochemistry. Univ Szeged, Dept Phys Chem & Mat Sci, H-6720 Szeged, Hungary.. (Tillämpad elektrokemi)
Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
Chalmers Univ Technol, Dept Phys, SE-41296 Gothenburg, Sweden..
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2018 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 122, no 4, p. 1913-1920Article in journal (Refereed) Published
Abstract [en]

For the promising Li-O-2 battery to be commercialized, further understanding of its constituents is needed. This study deals with the role of O-2 in Li-O-2 batteries, both its influence on electrochemical performance and its solubility in lithium-salt-containing dimethyl sulfoxide (DMSO) electrolytes. Experimentally, the electrochemical performance was evaluated using cylindrical ultramicroelectrodes. Two independent techniques, using a mass spectrometer and an optical sensor, were used to evaluate the O-2 solubility, expressed as Henry's constant. Furthermore, the ionic conductivity, dynamic viscosity, and density were also measured. Density functional theory calculations were made of the interaction energy between O-2 and the different species in the electrolytes. When varying O-2 partial pressure, the current was larger at high pressures confirming that the O-2 concentration is of key importance when studying the kinetics of this system. Compared with neat DMSO, the O-2 solubility increased with addition of LiTFSI and decreased with addition of LiClO4, indicating that the salt influences the solubility. This solubility trend is best explained in terms of apparent molar volume and interaction energy between O-2 and the salt anion. In conclusion, this study shows the importance of O-2 concentration, not just its partial pressure, and that the choice of Li salt can make this concentration increase or decrease.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018. Vol. 122, no 4, p. 1913-1920
National Category
Inorganic Chemistry
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URN: urn:nbn:se:kth:diva-225314DOI: 10.1021/acs.jpcc.7b09218ISI: 000424316200004Scopus ID: 2-s2.0-85041444544OAI: oai:DiVA.org:kth-225314DiVA, id: diva2:1195234
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QC 20180404

Available from: 2018-04-04 Created: 2018-04-04 Last updated: 2018-05-24Bibliographically approved

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Lindberg, JonasEndrodi, BalazsCornell, Ann M.Lindbergh, Göran

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