| Autor: |
Stirrup, K.-A. M., Rodriguez, M. A., Coker, E. N., Griego, J. J. M., Anderson, T. M. |
| Zdroj: |
Powder Diffraction; June 2019, Vol. 34 Issue: 2 p90-96, 7p |
| Abstrakt: |
High-temperature X-ray diffraction with concurrent gas chromatography (GC) was employed in the study of iron disulfide (FeS2) cathode pellets disassembled from thermal batteries. When FeS2cathode materials were analyzed in an air environment, reaction of the KCl and LiCl salt phases led to the formation of Li2(SO4) and KFe2S3phases beginning at ~230 °C. These phases subsequently reacted to generate various forms of potassium iron sulfates in the 280–500 °C range, with the final products resulting in a β-Fe2O3phase and K2(SO4). Independent simultaneous thermal analysis coupled with mass spectroscopy (MS) augmented the diffraction results and supported the overall picture of FeS2decomposition. Both gas analysis measurements (i.e. GC and MS) from the independent experiments confirmed the formation of SO2off-gas species during the breakdown of the FeS2. In contrast, characterization of the same cathode material under inert conditions showed the persistence of the initial FeS2phase throughout the entire temperature range of analysis. |
| Databáze: |
Supplemental Index |
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