Sulfurization of polymers. 4. Poly(4,5,6,7-tetrathiono-4,5,6,7-tetrahydrobenzothiophene-2,3-diyl) and related structures based on polystyrene and elemental sulfur |
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Authors: | Trofimov B A Skotheim T A Mal"kina A G Sokolyanskaya L V Myachina G F Korzhova S A Vakul"skaya T I Klyba L V Stoyanov E S Kovalev I P Mikhailik Yu V |
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Institution: | (1) Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 ul. Favorskogo, 664033 Irkutsk, Russian Federation;(2) Moltech Corporation, 9062 South Rita Road, Tucson, Arizona, USA;(3) G. K. Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, 5 prosp. Akad. Lavrent'eva, 630090 Novosibirsk, Russian Federation |
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Abstract: | Polystyrene was exhaustively sulfurized with elemental sulfur at 190--370 °C to liberate hydrogen sulfide and to form black lustrous powders (the sulfur content was up to 67%) possessing conductivity (10–7--10–6 S cm–1 upon doping with I2), paramagnetic properties ((3.4--13)·1019 sp g–1, g = 2.0040--2.0046, H = 0.36--0.47 mT), and redox properties. The use of these polymers as active cathode materials in lithium batteries allows their repeated cycling at a specific discharge capacity of up to 330 mA h g–1. The data of elemental analysis and differential scanning calorimetry, the IR and ESR spectra, the conductivities, and the character of electrochemical activity of the polymers synthesized are consistent with poly(4,5,6,7-tetrathiono-4,5,6,7-tetrahydrobenzothiophene-2,3-diyl) and related structures. |
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Keywords: | polystyrene elemental sulfur sulfurization fused polybenzothiophenes conductivity paramagnetism electrochemical activity |
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