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A novel, low cost and environmentally sustainable lithium sulfide-carbon composite cathode, suitably prepared by combining polyethylene oxide (PEO), LiCF 3 SO 3 and Li 2 S-C powders is here presented. The cathode is characterized in lithium-metal cell employing a solution of LiCF 3 SO 3 salt in dioxolane-dimethylether (DOL-DME) as the electrolyte. Detailed NMR investigation of the diffusion properties of the electrolyte is reported in order to determine its suitability for the proposed cell. The addition of LiNO 3 to the electrolyte solution allows practical application in a lithium sulfur cell using the Li 2 S-C-based cathode characterized by a specific capacity of about 500 mAh g -1 (as referenced to the Li 2 S mass). The cell holds its optimal performances for over 70 cycles at C/5 rate, with a steady state efficiency approaching 99%. X-ray diffraction patterns of the cell upon operation suggest the reversibility of the Li 2 S electrochemical process, while repeated electrochemical impedance spectroscopy (EIS) measurements indicate the suitability of the electrode-electrolyte interface in terms of low and stable cell impedance. Furthermore, the EIS study clarifies the activation process occurring at the Li 2 S cathode during the first charge process, leading to the decrease of the cell polarization during the following cycles. The data here reported shed light on important aspects to be considered for the efficient application of the Li 2 S cathode in lithium battery.

Insight on the Li2S electrochemical process in a composite configuration electrode

Insight on the Li₂S electrochemical process in a composite configuration electrode