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Analysis of the solid electrolyte interphase formed with an ionic liquid electrolyte for lithium-sulfur batteries

Shizhao Xiong (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; K. Xie ; Erik Blomberg (Institutionen för rymd- och geovetenskap, Radarfjärranalys) ; Per Jacobsson (Institutionen för teknisk fysik, Kondenserade materiens fysik) ; Aleksandar Matic (Institutionen för teknisk fysik, Kondenserade materiens fysik)
Journal of Power Sources (0378-7753). Vol. 252 (2014), p. 150-155.
[Artikel, refereegranskad vetenskaplig]

We have investigated the formation of the solid electrolyte interphase (SEI) on lithium electrodes in the presence of an ionic liquid electrolyte with a particular focus on the influence of polysulfides present in the electrolyte on the SEI. The electrochemical performance of symmetric cells with lithium electrodes and electrolytes composed of N-Methyl-(n-butyl)pyrrolidinium bis(trifluoromethanesulfonyl)imide (PYR14-TFSI) and LiTFSI, with and without the addition of polysulfides, were analyzed as well as the chemical composition of the SEI, before and after cycling. The cycling behavior of the symmetrical cells shows that the SEI films are relatively stable in the ionic liquid electrolyte, also in the presence of polysulfides. However, the presence of polysulfides results in a higher SEI layer resistance (R-SEI) and a higher activation energy. From X-ray photoelectron spectroscopy spectra (XPS), with argon-ion sputtering for depth profiling, we find that the SEI is formed by decomposition products from both cations and anions of the electrolyte. The XPS spectra show that the presence of polysulfides alters the decomposition process of the electrolyte, resulting in a SEI film with different chemical composition and structure, in line with the results from the electrochemical performance.

Nyckelord: Solid electrolyte interphase, Ionic liquid, Polysulfides, X-ray photoelectron spectroscopy, Lithium-sulfur batteries



Denna post skapades 2015-01-30. Senast ändrad 2016-09-05.
CPL Pubid: 211783

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Kondenserade materiens fysik (1900-2015)
Institutionen för rymd- och geovetenskap, Radarfjärranalys

Ämnesområden

Elektrokemi
Teknisk fysik

Chalmers infrastruktur