Abstract—
To assess the possible degradation mechanisms of lithium–sulfur batteries during their cycling, cyclic voltammograms of sulfur electrode in normalized coordinates were analyzed. A capacity decrease at the low-voltage plateau is shown to correspond to the decrease in the active material amount, whereas decrease at the high-voltage plateau is characterized by a decrease in the reduction depth. The sulfur solubility in the dioxolane–dimethoxyethane mixture (1 : 1) is measured; it is about 0.2 M at room temperature. It is concluded that the shuttle transfer of polysulfides is not the only cause of the degradation: the transfer of dissolved sulfur also makes a significant contribution.
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Notes
The using of the stainless-steel electrode substrates was found [4] to accelerate the sulfur electrode self-discharge; however, this fact received no physical explanation.
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This work is carried out with financial support from the Ministry of Sciences and Higher Education of RF.
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Translated by Yu. Pleskov
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Kulova, T.L., Li, S.A., Ryzhikova, E.V. et al. Possible Causes of Lithium–Sulfur Battery Degradation. Russ J Electrochem 58, 391–397 (2022). https://doi.org/10.1134/S102319352205007X
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DOI: https://doi.org/10.1134/S102319352205007X