Polyethylene Oxide (PEO)-Based Electrolyte for Lithium Sulfur Polymer Battery
However, the Li-S electrochemical process leads to the formation of various polysulfide, i.e. species soluble in the common electrolytes, thus causing parasitic reaction and shuttle effects . Furthermore, electrolytes such as carbonate have low thermal stability and flammability issues . Hence, the study of electrolytes capable of supporting the high performance of the new electrode materials and the associated problems is necessary to optimize the cell performances. In this scenario, the ideal candidate for the use in the new generation of batteries is the polyethylene oxide-based electrolyte . Herein, we report the characterization of a PEO-based membrane using LiCF3SO3 as the lithium-ion salt. The electrolyte, considered as suitable media for lithium-sulfur battery and characterized by high safety level, has been studied in terms of thermal properties (TGA, DSC), lithium ion conductivity, lithium interface stability, lithium transference number and cyclic voltammetry. Finally, a lithium-sulfur cell using the selected electrolyte has been efficiently investigated, by galvanostatic charge-discharge test, evidencing promising results in terms of delivered capacity and stability (see figure below reporting a typical charge discharge cycling profile of the studied lithium-sulfur polymer cell).
(Figure reports typical charge discharge cycling profile of the studied lithium-sulfur polymer cell)
This work was supported by Sapienza University-Volkswagen AG joint project
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 Sheng S. Zhang Journal of Power Sources 231 (2013) 153e162
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