Thermal battery degradation mechanisms

Technical Report · Tue Sep 01 00:00:00 EDT 2015

DOI:https://doi.org/10.2172/1222664· OSTI ID:1222664

Missert, Nancy A. ^[1]; Brunke, Lyle Brent ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Diffuse reflectance IR spectroscopy (DRIFTS) was used to investigate the effect of accelerated aging on LiSi based anodes in simulated MC3816 batteries. DRIFTS spectra showed that the oxygen, carbonate, hydroxide and sulfur content of the anodes changes with aging times and temperatures, but not in a monotonic fashion that could be correlated to phase evolution. Bands associated with sulfur species were only observed in anodes taken from batteries aged in wet environments, providing further evidence for a reaction pathway facilitated by H₂S transport from the cathode, through the separator, to the anode. Loss of battery capacity with accelerated aging in wet environments was correlated to loss of FeS₂ in the catholyte pellets, suggesting that the major contribution to battery performance degradation results from loss of active cathode material.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1222664
• Report Number(s): SAND-2015-8383R; 607108
• Country of Publication: United States
• Language: English