Synthesis and electrochemical properties of polypyrrole-coated poly(2,5-dimercapto-1,3,4-thiadiazole) |
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Institution: | 1. National Institute of Chemistry, Hajdrihova 11, 1000 Ljubljana, Slovenia;2. Faculty of Chemistry and Chemical Technology, University of Ljubljana, Ve?na Pot 113, 1000 Ljubljana, Slovenia;3. Honda R&D Europe, Carl-Legien-Strasse 30, 63073 Offenbach, Germany |
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Abstract: | A new composite cathode active material, conductive polypyrrole (PPy)-coated poly(2,5-dimercapto-1,3,4-thiadiazole) (PDMcT) was prepared as a thin film via the surfactant template (TFST) technique. The formation of the uniform and well-connected film on the surface of PDMcT particles was confirmed by Fourier transform infrared spectra (FT-IR) and transmission electron micrographs (TEM). By cyclic voltammetry and galvanostatic charge–discharge tests, the coated composite showed a better electrochemical performance than PDMcT, such as enhanced redox processes and improved coulumbic efficiency, etc. The electrical conductivity of the material reached to 10?3 S cm?1 and an initial discharge capacity of 250 mAhg?1 was obtained. Moreover, it showed a slower fading of discharge capacity than PDMcT when used as cathode material in secondary lithium batteries with liquid electrolyte solution. |
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