The role of FeS in initial activation and performance degradation of Na-NiCl2 batteries

JOURNAL OF POWER SOURCES

卷:272

Article

Li, Guosheng¹  Lu, Xiaochuan¹  Kim, Jin Y.¹  Engelhard, Mark H.²  Lemmon, John P.¹  Sprenkle, Vincent L.¹ 

[1] Pacific NW Natl Lab, Enen Proc & Mat Div, Richland, WA 99352 USA

[2] Pacific NW Natl Lab, Environm & Mol Sci Lab, Richland, WA 99352 USA

关键词: Sodium-nickel chloride battery;    Cell activation;    Ni particle growth;    Passivation layer;    Cathode additives;   

DOI  :  10.1016/j.jpowsour.2014.08.106

来源: Elsevier

【 摘 要 】

The role of iron sulfide (FeS) in initial cell activation and degradation in Na-NiCl2 battery was investigated in this work. The research focused on identifying the effects of FeS levels on the electrochemical performance and morphological changes in the cathode. The x-ray photoelectron spectroscopy study along with battery tests revealed that FeS plays a critical role in initial battery activation by removing passivation layers on Ni particles. It was also found that the optimum level of FeS in the cathode resulted in suppressing Ni particle growth and improved battery cycling performance. The results of electrochemical characterization indicated that sulfur species generated in situ during initial charging, such as polysulfide and element sulfur, are responsible for removing the passivation layer. Consequently, the cells containing elemental sulfur in the cathode exhibited similar electrochemical behavior during initial charging compared to the cells containing FeS. Published by Elsevier B.V.

【 授权许可】

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