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Revitalizing Li–S batteries : the power of electrolyte additives
Derek Ovc-Okene, Lakshmi Shiva Shankar, Alen Vižintin, Robert Kun, 2025, pregledni znanstveni članek

Objavljeno v DiRROS: 10.03.2025; Ogledov: 280; Prenosov: 145
.pdf Celotno besedilo (9,24 MB)
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Sulfur speciation in Li–S batteries determined by operando laboratory X-ray emission spectroscopy
Ava Rajh, Alen Vižintin, Joanna Hoszowska, Robert Dominko, Matjaž Kavčič, 2024, izvirni znanstveni članek

Povzetek: In this work, operando sulfur X-ray emission measurementson a Li−S battery cathode were performed using a laboratory setup as analternative to more common synchrotron radiation based absorptionstudies. Photoexcitation by an X-ray tube was used. Valence-to-core Kβ X-ray emission spectra were recorded with a wavelength dispersive crystalspectrometer in von Hamos geometry, providing excellent energyresolution and good detection efficiency. The setup was used to recordex situ S Kβ emission spectra from S cathodes from the Li−S battery andalso under operando conditions. Average S oxidation state within thebattery cathode during battery cycling was determined from the shape ofthe Kβ emission spectra. A more detailed S species characterization wasperformed by fitting a linear combination of previously measuredlaboratory synthesized standards to the measured spectra. Relative amounts of different S species in the cathode were determinedduring the cycling of the Li−S battery. The main advantage of X-ray emission spectroscopy is that it can be performed onconcentrated samples with S loading comparable to a real battery. The approach shows great promise for routine laboratory analysisof electrochemical processes in Li−S batteries and other sulfur-based systems under operando conditions.
Ključne besede: X-ray emission spectroscopy, lithium−sulfur batteries, operando measurements, oxidation state, von Hamos spectrometer
Objavljeno v DiRROS: 19.12.2024; Ogledov: 320; Prenosov: 148
.pdf Celotno besedilo (2,22 MB)
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Which process limits the operation of a Li-S system?
Sara Drvarič Talian, Gregor Kapun, Jože Moškon, Alen Vižintin, Anna Randon-Vitanova, Robert Dominko, Miran Gaberšček, 2019, izvirni znanstveni članek

Objavljeno v DiRROS: 24.11.2020; Ogledov: 1977; Prenosov: 1393
.pdf Celotno besedilo (7,71 MB)
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