441. Study of Li-S batteries by S K-edge RIXS spectroscopyMatjaž Kavčič, Matjaž Žitnik, Klemen Bučar, Marko Petrič, Iztok Arčon, Robert Dominko, Alen Vižintin, 2016, published scientific conference contribution abstract Abstract: Li-S batteries are considered as one of the most promising candidates for future batteries in applications where high energy density is required [1]. Despite that the general principle of operation is known for a long time [2], the lack of detailed understanding of relevant operation mechanisms has so far prevented their extensive use. A Li-S battery is composed of a lithium metal anode and a sulfur based cathode, separated by a porous separator wetted with electrolyte. During the battery cycle the reduction and oxidation of S to Li2S and back proceeds through a complicated equilibrium mixture of compounds that are typically dissolved in the electrolyte in the form of long and short chain polysulfides. In order to improve our understanding of polysulfide formation and its interactions within electrode, which are essential to achieve the long term cycling stability, development and application of new analytical tools is required.
In this work sulfur K-edge resonant X-ray emission (RXES) measurements were performed on the Li-S battery in operando mode. The experiment was performed at the ID26 beamline at ESRF using the Johansson type tender x-ray emission spectrometer [3]. Full K-L RIXS maps were recorded on a set of chemically prepared Li2Sx sample standards characterized by different Li:S stoichiometric ratio, followed by the operando measurements on Li-S battery. Using the spectra recorded on Li2Sx standards two excitation energies were chosen and RXES spectra from the back of the battery cathode were sequentially acquired during one discharge cycle (C20). The relative amounts of each sulfur compound in the cathode during the discharge cycle were determined from the linear combination fit using measured reference standard spectra. Because of resonant excitation conditions the sensitivity for the polysulfide detection was significantly enhanced. Our work sets up S K-edge RIXS spectroscopy as an important analytical tool to study the mechanism of Li-polysulfide formation in the cathode and their interaction with the host matrix and electrolyte. Keywords: RIXS, RXES, Li-S battery, operando, Sulphur K-edge XANES, Lithium polysulphides, Li2S Published in RUNG: 28.06.2016; Views: 5743; Downloads: 0 This document has many files! More... |
442. Origin of atmospheric aerosols at the Pierre Auger Observatory using studies of air mass trajectories in South AmericaAndrej Filipčič, Thomas Paul, Danilo Zavrtanik, Marko Zavrtanik, Samo Stanič, Darko Veberič, A. Aab, 2014, original scientific article Keywords: kozmični žarki, aerosoli, onesnaženost zraka, Observatorij Pierre Auger Published in RUNG: 16.06.2016; Views: 4882; Downloads: 16 Link to full text |
443. Studies of cosmic rays at the highest energies with the Pierre Auger ObservatoryDarko Veberič, Thomas Paul, Samo Stanič, Andrej Filipčič, Danilo Zavrtanik, Marko Zavrtanik, J. R. T. De Mello Neto, 2014, published scientific conference contribution Keywords: kozmični žarki, spekter, observatoriji Published in RUNG: 16.06.2016; Views: 3884; Downloads: 21 Link to full text |
444. A search for point sources of EeV photonsSerguei Vorobiov, Samo Stanič, Andrej Filipčič, Thomas Paul, Darko Veberič, Danilo Zavrtanik, Marko Zavrtanik, A. Aab, 2014, original scientific article Keywords: kozmični žarki, fotoni, Observatorij Pierre Auger Published in RUNG: 16.06.2016; Views: 4599; Downloads: 20 Link to full text |
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446. Muons in air showers at the Pierre Auger Observatory : measurement of atmospheric production depthSerguei Vorobiov, Darko Veberič, Andrej Filipčič, Marko Zavrtanik, Samo Stanič, Danilo Zavrtanik, A. Aab, Ahmed Saleh, 2014, original scientific article Keywords: mioni, longitudinalna porazdelitev, modeli hadronskih interakcij, Observatorij Pierre Auger Published in RUNG: 16.06.2016; Views: 4639; Downloads: 142 Link to full text |
447. Reconstruction of inclined air showers detected with the Pierre Auger ObservatorySerguei Vorobiov, Samo Stanič, Danilo Zavrtanik, Darko Veberič, Andrej Filipčič, Marko Zavrtanik, A. Aab, 2014, original scientific article Keywords: kozmični žarki, mioni, Observatorij Pierre Auger Published in RUNG: 16.06.2016; Views: 4382; Downloads: 23 Link to full text |
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449. Cosmic ray composition studies with the Pierre Auger ObservatoryThomas Paul, Samo Stanič, Darko Veberič, Andrej Filipčič, Danilo Zavrtanik, Marko Zavrtanik, D. Boncioli, 2014, published scientific conference contribution Keywords: kozmični žarki, Observatorij Pierre Auger, kompozicija Published in RUNG: 16.06.2016; Views: 4094; Downloads: 16 Link to full text |
450. Measurement of the ultra high energy cosmic ray energy spectrum with the Pierre Auger ObservatoryDarko Veberič, Thomas Paul, Andrej Filipčič, Samo Stanič, Danilo Zavrtanik, Marko Zavrtanik, G. Rodriguez, 2014, published scientific conference contribution Keywords: kozmični žarki, Observatorij Pierre Auger, spekter Published in RUNG: 16.06.2016; Views: 3920; Downloads: 22 Link to full text |