2009年4月1日 · To elucidate the possible mechanism (s) during lithium extraction/insertion in Li 2 FeSiO 4 and Li 2 MnSiO 4 we performed in-situ XAS studies of the local environment and oxidation state of Fe and Mn cations upon lithium exchange, complemented by Mössbauer spectroscopic studies of Li 2 FeSiO 4.

1993年10月8日 · X-ray absorption spectroscopy (XAS) of Fe2+ in Fe2SiO4 liquid at 1575 kelvin and 10-4 gigapascal (1 bar) shows that the Fe2+ -O bond length is 1.98 ± 0.02 angstroms compared with ≈2.22 angstroms in...

2014年9月1日 · To elucidate the Li + extraction and insertion mechanism for Li 2 FeSiO 4 nanoparticles, at the atomic scale, X-ray absorption spectroscopy (XAS) measurements at Fe and Si K-edges were performed.

2021年6月28日 · By studying the local structure around the iron during electrochemical cycling using in situ x-ray absorption spectroscopy (XAS), it is possible to gain insight into the factors which determine the electrochemical properties of this material.

2021年6月28日 · In situ XAS provides the ideal local structural and electronic probe of the redox active element (Fe) in the NLFS@GO + CA cathode during electrochemical cycling. Quantitative modeling of these data can lead to a fundamental understanding that is critical for achieving maximum capacity.

2015年2月25日 · In situ X-ray Absorption Spectroscopy (XAS) results are presented for Li 2 FeSiO 4 and Li 2.2 Fe 0.9 SiO 4, promising cathode materials for lithium-ion batteries. The aims are to establish the valence and local structure of Fe during charge and discharge to understand if the Fe 3+ /Fe 4+ redox pair can be reached in the current battery design.

2021年4月6日 · By studying the local structure around the iron during electrochemical cycling using in situ x-ray absorption spectroscopy (XAS), it is possible to gain insight into the factors which determine...

2009年4月1日 · Li {sub 2}FeSiO {sub 4}/C and Li {sub 2}MnSiO {sub 4}/C cathode materials were a subject of in-situ characterisations during the first cycle of oxidation/reduction by complementary techniques of X-ray absorption spectroscopy and Moessbauer spectroscopy, whereby the changes in the local environment of Fe (and Mn) are monitored.

1993年10月8日 · X-ray absorption spectroscopy (XAS) of Fe(2+) in Fe(2)SiO(4) liquid at 1575 kelvin and 10(-4) gigapascal (1 bar) shows that the Fe(2+) -O bond length is 1.98 +/- 0.02 angstroms compared with approximately 2.22 angstroms in crystalline Fe(2)SiO(4) (fayalite) at the melting point (1478 kelvin), which …

Extended X-ray absorption fine structure (EXAFS) data reveal that a subsequent 2-electron or 4electron recharge generates a species with a Fe-S bond distance identical to that of pyrite, d (Fe-S)-2.259 A, with no other clearly detectable interactions due to more distant atoms.