Polysulfide-containing Glyme-based Electrolytes for Lithium Sulfur Battery
Artikel i vetenskaplig tidskrift, 2015

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).

Författare

M. Agostini

Sapienza, Università di Roma

Shizhao Xiong

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Aleksandar Matic

Chalmers, Teknisk fysik, Kondenserade materiens fysik

Jusef Hassoun

Sapienza, Università di Roma

Chemistry of Materials

0897-4756 (ISSN) 1520-5002 (eISSN)

Vol. 27 4604-4611

Ämneskategorier

Den kondenserade materiens fysik

DOI

10.1021/acs.chemmater.5b00896