Development of co-doped Li2S-borate-based glass system as energy storage applications: X-ray absorption spectroscopy aspect
Source abstract
Abstract
Abstract Li2S-2H3BO3: xCoN2O6.6H2O (x = 3, 4 and 5mol %) glass system was prepared. The microstructure and physical properties of glasses were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Vis spectrophotometer and vibrating sample magnetometer (VSM). In order to measure the electrochemical properties of glasses, the cycling voltammograms (CVs) was employed where the highest specific capacitances of 97.972 mV/s was obtained from x= 5mol%. For structure-function of glasses, the S and Co oxidation states at S K-edge and Co K-edge and local structure around Co ions were studied by X-ray absorption spectroscopy (XAS) including X-ray absorption near edge structure (XANES) and extended X-ray absorption spectroscopy (EXAFS). It was found that, the S6+ oxidation state and mixing Co2+/3+ were revealed, respectively. Moreover, the Co K-edge EXAFS fitting was exhibited co-existence of CoA-O bond (tetrahedral coordination) and CoB-O bond (octahedral coordination) in all fabricated glasses with a difference proportional site.
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Research context
OpenAlex topics: Advancements in Battery Materials · Advanced Battery Materials and Technologies · Advanced Battery Technologies Research
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