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Št. zadetkov: 6
Karakterizacija baterij litij-žveplo z rentgensko emisijsko spektroskopijo
Ava Rajh, Matjaž Kavčič
Magistrsko delo
Oznake: rentgenska spektroskopija;spektroskopija PIXE;baterija litij-žveplo;Braggov kristalni spektrometer;teorija gostotnih funkcionalov;
V magistrski nalogi smo z uporabo rentgenske emisijske spektroskopije karakterizirali potek redukcije žvepla med praznjenjem baterije litij-žveplo. Izmerili smo emisijske spektre K\(\alpha\) in K\(\beta\) na standardnih vzorcih žveplovih polisulfidov in statičnih katodah baterije ustavljene v proces ...
Leto: 2020 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Characterization of structural changes in batteries by X-ray Raman and emission spectroscopy
Ava Rajh, Matjaž Kavčič
Doktorska disertacija
Oznake: X-ray emission spectroscopy;Raman scattering;density functional theory;next generation batteries;
This thesis presents the development and application of novel characterization methodologies for studying structural and chemical changes in next generation battery technologies. This research focuses on the development and application of photon-in/photon-out spectroscopies, in particular X-ray Rama ...
Leto: 2025 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Sulfur speciation in Li–S batteries determined by operando laboratory X-ray emission spectroscopy
Ava Rajh, Alen Vižintin, Joanna Hoszowska, Robert Dominko, Matjaž Kavčič
Izvirni znanstveni članek
Oznake: elektrokemija;baterije;akumulatorji;rentgenska emisijska spektrometrija;litij-žveplovi akumulatorji;X-ray emission spectroscopy;lithium−sulfur batteries;operando measurements;oxidation state;von Hamos spectrometer;
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 ...
Leto: 2024 Vir: Institut Jožef Stefan (IJS)
Structural and chemical analysis of hard carbon negative electrode for Na-ion battery with X-ray Raman scattering and solid-state NMR spectroscopy
Ava Rajh, Matej Gabrijelčič, Blaž Tratnik, Klemen Bučar, Iztok Arčon, Marko Petric, Robert Dominko, Alen Vižintin, Matjaž Kavčič
Izvirni znanstveni članek
Oznake: trdi ogljik;hard carbon;
This study explores the structural changes of hard carbon (HC) negative electrodes in sodium-ion batteries induced by insertion of Na ions during sodiation. X-ray Raman spectroscopy (XRS) was used to record both C and Na K-edge absorption spectra from bulk HC anodes carbonized at different temperatu ...
Leto: 2024 Vir: Fakulteta za matematiko in fiziko (UL FMF)
ǂA ǂparallel-beam wavelength-dispersive X-ray emission spectrometer for high energy resolution in-air micro-PIXE analysis
Kristina Isaković, Marko Petric, Ava Rajh, Zdravko Rupnik, Mirko Ribič, Klemen Bučar, Primož Pelicon, Paula Pongrac, Valentina Stojilkovič, Matjaž Kavčič
Izvirni znanstveni članek
Oznake: parallel-beam wavelength-dispersive X-ray emission spectrometer;characteristics;micro-PIXE analysis;
A new parallel-beam wavelength dispersive (PB-WDS) X-ray emission spectrometer was constructed at the external proton beamline at the Microanalytical Centre of the Jožef Stefan Institute in Ljubljana. The spectrometer combines polycapillary X-ray optics for efficient X-ray collection with diffractio ...
Leto: 2023 Vir: Biotehniška fakulteta (UL BF)
Characterization of electrochemical processes in metal-organic batteries by X-ray Raman spectroscopy
Ava Rajh, Iztok Arčon, Klemen Bučar, Matjaž Žitnik, Marko Petric, Alen Vižintin, Jan Bitenc, Urban Košir, Robert Dominko, Hlynur Gretarsson, Martin Sundermann, Matjaž Kavčič
Izvirni znanstveni članek
Oznake: X-ray Raman spectroscopy;meta-organic batteries;oxygen K-edge XANES;electrochemical processes;
X-ray Raman spectroscopy (XRS) is an emerging spectroscopic technique that utilizes inelastic scattering of hard Xrays to study X-ray absorption edges of low Z elements in bulk material. It was used to identify and quantify the amount of carbonyl bonds in a cathode sample, in order to track the ...
Leto: 2022 Vir: Fakulteta za matematiko in fiziko (UL FMF)
Št. zadetkov: 6
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