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, objavljeni povzetek znanstvenega prispevka na konferenci Opis: 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. Ključne besede: RIXS, RXES, Li-S battery, operando, Sulphur K-edge XANES, Lithium polysulphides, Li2S Objavljeno v RUNG: 28.06.2016; Ogledov: 5745; Prenosov: 0 Gradivo ima več datotek! Več... |
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, izvirni znanstveni članek Ključne besede: kozmični žarki, aerosoli, onesnaženost zraka, Observatorij Pierre Auger Objavljeno v RUNG: 16.06.2016; Ogledov: 4883; Prenosov: 16 Povezava na celotno besedilo |
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, objavljeni znanstveni prispevek na konferenci Ključne besede: kozmični žarki, spekter, observatoriji Objavljeno v RUNG: 16.06.2016; Ogledov: 3889; Prenosov: 21 Povezava na celotno besedilo |
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, izvirni znanstveni članek Ključne besede: kozmični žarki, fotoni, Observatorij Pierre Auger Objavljeno v RUNG: 16.06.2016; Ogledov: 4600; Prenosov: 20 Povezava na celotno besedilo |
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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, izvirni znanstveni članek Ključne besede: mioni, longitudinalna porazdelitev, modeli hadronskih interakcij, Observatorij Pierre Auger Objavljeno v RUNG: 16.06.2016; Ogledov: 4642; Prenosov: 142 Povezava na celotno besedilo |
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, izvirni znanstveni članek Ključne besede: kozmični žarki, mioni, Observatorij Pierre Auger Objavljeno v RUNG: 16.06.2016; Ogledov: 4383; Prenosov: 23 Povezava na celotno besedilo |
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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, objavljeni znanstveni prispevek na konferenci Ključne besede: kozmični žarki, Observatorij Pierre Auger, kompozicija Objavljeno v RUNG: 16.06.2016; Ogledov: 4095; Prenosov: 16 Povezava na celotno besedilo |
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, objavljeni znanstveni prispevek na konferenci Ključne besede: kozmični žarki, Observatorij Pierre Auger, spekter Objavljeno v RUNG: 16.06.2016; Ogledov: 3922; Prenosov: 22 Povezava na celotno besedilo |