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Metal–Sulfur Battery Cathodes Based on PAN–Sulfur Composites by Shuya Wei; Lin Ma; Kenville E. Hendrickson; Zhengyuan Tu; Lynden A. Archer is a Chemistry article available to read on EtoBox.

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Sulfur/polyacrylonitrile composites provide a promising route toward cathode materials that overcome multiple, stubborn technical barriers to high-energy, rechargeable lithium-sulfur (Li-S) cells. Using a facile thermal synthesis procedure in which sulfur and polyacrylonitrile (PAN) are the only reactants, we create a family of sulfur/PAN (SPAN) nanocomposites in which sulfur is maintained as S 3 / S 2 during all stages of the redox process. By entrapping these smaller molecular sulfur species in the cathode through covalent bonding to and physical confinement in a conductive host, these materials are shown to completely eliminate polysulfide dissolution and shuttling between lithium anode and sulfur cathode. We also show that, in the absence of any of the usual salt additives required to stabilize the anode in traditional Li-S cells, Li-SPAN cells cycle trouble free and at high Coulombic efficiencies in simple carbonate electrolytes. Electrochemical and spectroscopic analysis of the SPAN cathodes at various stages of charge and discharge further show a full and reversible reduction and oxidation between elemental sulfur and Liions in the electrolyte to produce Li 2 S as the only d

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Author

Shuya Wei; Lin Ma; Kenville E. Hendrickson; Zhengyuan Tu; Lynden A. Archer

Publisher

American Chemical Society (ACS)

Published

2015

Language

EN

Field

Chemistry (Physical Sciences)