Polysulfide-containing Glyme-based Electrolytes for Lithium Sulfur Battery

Agostini, M.Universita degli Studi di Roma la Sapienza,Sapienza University of Rome (författare)

A new comparative investigation of lithium sulfur cells employing a tetraethylene glycol dimethyl ether-lithium trifluoromethanesulfonate (TEGDME-LiCF3SO3) electrolyte charged by various polysulfide species (Li2S2, Li2S4, Li2S6, and Li2S8) is here reported. We carefully detect the effects of lithium polysulfide addition by originally combining X-ray photoelectron spectroscopy (XPS) and electrochemical impedance spectroscopy (EIS). The measurements clearly reveal how the polysulfide addition affects the nature and composition of the solid electrolyte interphase (SEI) in terms of precipitated S-based species determined by XPS. The study demonstrates that the SEI layer formed on the Li anode decreases in impedance and stabilizes by the presence of polysulfide. This, together with a buffer effect strongly mitigating the sulfur-cathode dissolution and the shuttle reaction, significantly improves the stability of the lithium-sulfur cell. The data here reported clearly suggest the polysulfide as an effective additive to enhance the performance of the lithium-sulfur battery (Graph Presented).

Xiong, ShizhaoChalmers tekniska högskola,Chalmers University of Technology (författare)
Matic, Aleksandar,1968Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)matic (författare)
Hassoun, JusefUniversita degli Studi di Roma la Sapienza,Sapienza University of Rome (författare)
Universita degli Studi di Roma la SapienzaChalmers tekniska högskola (creator_code:org_t)

Ingår i:Chemistry of Materials: American Chemical Society (ACS)27:13, s. 4604-46111520-50020897-4756

Av författaren/redakt...: Agostini, M.; Xiong, Shizhao; Matic, Aleksanda ...; Hassoun, Jusef

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