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Monitoring of CoS2 reactions using high-temperature XRD coupled with gas chromatography (GC)

Journal Article · · Powder Diffraction
 [1];  [1];  [1];  [1];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
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High-temperature X-ray diffraction with concurrent gas chromatography (GC) was used to study cobalt disulfide cathode pellets disassembled from thermal batteries. When CoS2 cathode materials were analyzed in an air environment, oxidation of the K(Br, Cl) salt phase in the cathode led to the formation of K2SO4 that subsequently reacted with the pyrite-type CoS2 phase leading to cathode decomposition between ~260 and 450 °C. Here, independent thermal analysis experiments, i.e. simultaneous thermogravimetric analysis/differential scanning calorimetry/mass spectrometry (MS), augmented the diffraction results and support the overall picture of CoS2 decomposition. Both gas analysis measurements (i.e. GC and MS) from the independent experiments confirmed the formation of SO2 off-gas species during breakdown of the CoS2. In contrast, characterization of the same cathode material under inert conditions showed the presence of CoS2 throughout the entire temperature range of analysis.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1340273
Alternate ID(s):
OSTI ID: 1328115
Report Number(s):
SAND--2017-0302J; 650344
Journal Information:
Powder Diffraction, Journal Name: Powder Diffraction Journal Issue: 02 Vol. 31; ISSN 0885-7156; ISSN applab
Publisher:
Cambridge University PressCopyright Statement
Country of Publication:
United States
Language:
English

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Thermal stability and phase transformation of electrochemically charged/discharged LiMnPO4 cathode for Li-ion batteries journal January 2011
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Cited By (1)

Suppressing self-discharge of Li–B/CoS 2 thermal batteries by using a carbon-coated CoS 2 cathode journal January 2018

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY