Application of new analytical tools providing insight into the mechanism of lithium–polysulfide formation in the cathode and their interaction with the host matrix and electrolyte is essential for further development of Li–S batteries. In this work, resonant inelastic X-ray scattering (RIXS) measurements at the sulfur K-edge were performed on the Li–S battery in operando mode to study the lithium-polysulfide formation during the discharge process. The relative amounts of each sulfur compound in the cathode during the discharge process were determined from the linear combination fit using reference spectra measured on standard sulfur compounds. Because of resonant excitation condition the sensitivity for the lithium–polysulfide detection was significantly enhanced, while the sulfate signal from the electrolyte was heavily suppressed. In addition, the influence of self-absorption effects in the analysis was minimized due to fixed excitation energy. Consequently, a full quantitative analysis could be performed for the conventional Li–S battery consisting of sulfur–carbon composite cathode free from any additives and a LiTFSI based electrolyte.
F.01 Acquisition of new practical knowledge, information and skills
COBISS.SI-ID: 29919271We have published a study about air quality parameters which are affected by people exercising in inner spaces. The results allow to estimate an additional input of respiratory particulate matter under typical atmospheric conditions in the gym and are immediatelly applicable to vaste number of similar cases. We report results of analysis of a month-long measurement of indoor air and environment quality parameters in one gym during sporting activities such as football, basketball, volleyball, badminton, boxing, and fitness. We have determined an average single person’s contribution to the increase of temperature, humidity, and dust concentration in the gym air volume of 12500 m3: during 90-min exercise performed at an average heart rate of 143(10) bpm, a single person evaporated 0.94 kg of water in to the air by sweating, contributed 0.03 K to the air temperature rise and added 1.5 μg/m3 and 5 ng/m3 to the indoor concentration of inhalable particles (PM10) and Ca concentration, respectively. As the breathing at the observed exercise intensity was about three times faster with respect to the resting condition and as the exercise-induced PM10 concentration was about two times larger than outdoors, a sportsman in the gym would receive about a sixfold higher dose of PM10 inside than he/she would have received at rest outside.
F.17 Transfer of existing technologies, know-how, methods and procedures into practice
COBISS.SI-ID: 1538041540This work tackles important problems regarding durability of hip prostetic components once they are mounted in the body. Very often the placement of the component is the only way to restore the quality of movement, especially for older people. In particular, the influence of polyacetal wear particles on aseptic loosening of non-cemented isoelastic femoral stems with polyacetal coating remains unclear. The aim of our study was to use nuclear methods to prove the presence of polyacetal wear particles, to determine their morphology and to check their distribution in the tissues around loosened hip prosthetic components.
F.21 Development of new health/diagnostic methods/procedures
COBISS.SI-ID: 28801063Iztok Arčon has given a beautiful presentation of his invited plenary talk at the high school Celje at the occasion of the International Year of Light, 4. 12. 2015. This is an important achievement of our research programme member and concerns popularization of science
B.04 Guest lecture
COBISS.SI-ID: 4090875In the first semester of 2015-2016 school year start of lectures in Atomic Physics at Faculty of Mathematics and Physics at University of Ljubljana. About 10 course members, mainly students of physics. One semester course with 5 ETCS (2/1). Lecturer prof. dr. M. Žitnik, assistant doc. dr. A. Mihelič.
D.10 Educational activities