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Monitoring of FES2 reactions using high-temperature XRD coupled with gas chromatography

Published online by Cambridge University Press:  03 May 2019

K.-A. M. Stirrup ,
M. A. Rodriguez ,
E. N. Coker ,
J. J. M. Griego  and
T. M. Anderson
K.-A. M. Stirrup
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1411
M. A. Rodriguez*
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1411
E. N. Coker
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1411
J. J. M. Griego
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1411
T. M. Anderson
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185-1411
*
a)Author to whom correspondence should be addressed. Electronic mail: marodri@sandia.gov
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Abstract

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 FeS2 cathode materials were analyzed in an air environment, reaction of the KCl and LiCl salt phases led to the formation of Li2(SO4) and KFe2S3 phases 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-Fe2O3 phase and K2(SO4). Independent simultaneous thermal analysis coupled with mass spectroscopy (MS) augmented the diffraction results and supported the overall picture of FeS2 decomposition. Both gas analysis measurements (i.e. GC and MS) from the independent experiments confirmed the formation of SO2 off-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 FeS2 phase throughout the entire temperature range of analysis.

Keywords

high-temperature XRDgas chromatographypyrite FeS2
Type
Technical Article
Information
Powder Diffraction , Volume 34 , Issue 2 , June 2019 , pp. 90 - 96
Copyright
Copyright © International Centre for Diffraction Data 2019 

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