Effect of the Anion Activity on the Stability of Li Metal Anodes in Lithium-Sulfur Batteries

Ruiguo Cao, Junzheng Chen, Kee Sung Han, Wu Xu, Donghai Mei, Priyanka Bhattacharya, Mark H. Engelhard, Karl Todd Mueller, Jun Liu, Ji Guang Zhang

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

With the significant progress made in the development of cathodes in lithium-sulfur (Li-S) batteries, the stability of Li metal anodes becomes a more urgent challenge in these batteries. Here the systematic investigation of the stability of the anode/electrolyte interface in Li-S batteries with concentrated electrolytes containing various lithium salts is reported. It is found that Li-S batteries using LiTFSI-based electrolytes are more stable than those using LiFSI-based electrolytes. The decreased stability is because the N-S bond in the FSI- anion is fairly weak and the scission of this bond leads to the formation of lithium sulfate (LiSOx) in the presence of polysulfide species. In contrast, in the LiTFSI-based electrolyte, the lithium metal anode tends to react with polysulfide to form lithium sulfide (LiSx), which is more reversible than LiSOx formed in the LiFSI-based electrolyte. This fundamental difference in the bond strength of the salt anions in the presence of polysulfide species leads to a large difference in the stability of the anode-electrolyte interface and performance of the Li-S batteries with electrolytes composed of these salts. Therefore, anion selection is one of the key parameters in the search for new electrolytes for stable operation of Li-S batteries.

Original languageEnglish (US)
Pages (from-to)3059-3066
Number of pages8
JournalAdvanced Functional Materials
Volume26
Issue number18
DOIs
StatePublished - May 10 2016

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lithium sulfur batteries
Electrolytes
Anions
Anodes
anodes
Negative ions
Metals
electrolytes
anions
metals
polysulfides
Polysulfides
Lithium
Salts
lithium
salts
lithium sulfates
Lithium sulfur batteries
electric batteries
sulfides

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Cao, R., Chen, J., Han, K. S., Xu, W., Mei, D., Bhattacharya, P., ... Zhang, J. G. (2016). Effect of the Anion Activity on the Stability of Li Metal Anodes in Lithium-Sulfur Batteries. Advanced Functional Materials, 26(18), 3059-3066. https://doi.org/10.1002/adfm.201505074
Cao, Ruiguo ; Chen, Junzheng ; Han, Kee Sung ; Xu, Wu ; Mei, Donghai ; Bhattacharya, Priyanka ; Engelhard, Mark H. ; Mueller, Karl Todd ; Liu, Jun ; Zhang, Ji Guang. / Effect of the Anion Activity on the Stability of Li Metal Anodes in Lithium-Sulfur Batteries. In: Advanced Functional Materials. 2016 ; Vol. 26, No. 18. pp. 3059-3066.
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Cao, R, Chen, J, Han, KS, Xu, W, Mei, D, Bhattacharya, P, Engelhard, MH, Mueller, KT, Liu, J & Zhang, JG 2016, 'Effect of the Anion Activity on the Stability of Li Metal Anodes in Lithium-Sulfur Batteries', Advanced Functional Materials, vol. 26, no. 18, pp. 3059-3066. https://doi.org/10.1002/adfm.201505074

Effect of the Anion Activity on the Stability of Li Metal Anodes in Lithium-Sulfur Batteries. / Cao, Ruiguo; Chen, Junzheng; Han, Kee Sung; Xu, Wu; Mei, Donghai; Bhattacharya, Priyanka; Engelhard, Mark H.; Mueller, Karl Todd; Liu, Jun; Zhang, Ji Guang.

In: Advanced Functional Materials, Vol. 26, No. 18, 10.05.2016, p. 3059-3066.

Research output: Contribution to journalArticle

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AU - Cao, Ruiguo

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AU - Xu, Wu

AU - Mei, Donghai

AU - Bhattacharya, Priyanka

AU - Engelhard, Mark H.

AU - Mueller, Karl Todd

AU - Liu, Jun

AU - Zhang, Ji Guang

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