Ethynedithiol‐based polyeneoligosulfides as active cathode materials for lithium‐sulfur batteries |
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| Authors: | B A Trofimov G F Myachina I V Rodionova A G Mal'kina I A Dorofeev T I Vakul'skaya L M Sinegovskaya T A Skotheim |
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| Affiliation: | 1. A. E. Favorsky Institute of Chemistry, Siberian Division of the Russian Academy of Sciences, Irkutsk, Russia;2. Intex, 7080 Cathedral Rock Pl., Tucson, Arizona 85718 |
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| Abstract: | Ethynedithiol‐based polyeneoligosulfides have been synthesized in 96% yield by the reaction of sodium acetylides (HC?CNa, NaC?CSNa) and elemental sulfur through the Na? Csp bond in liquid ammonia with the following spontaneous polymerization of ethynedithiols (HSC?CSH) formed by the hydrolysis. The polyeneoligosulfides synthesized are brown powders (up to 77% sulfur content, mp 128–184°C), partially soluble in organic solvents. They are high‐resistance semiconductors (10?13 to 10?14 S cm?1), possess paramagnetic (1017 to 1018 spin g?1) and redox properties. The oligosulfides obtained, being redox systems capable of reversible redox processes, provide high values of discharge capacity (345–720 mA h g?1) of rechargeable lithium‐sulfur batteries. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 |
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| Keywords: | ethynedithiol polyeneoligosulfides lithium‐sulfur batteries |
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