Polydiphenylamine/carbon nanotube composites for applications in rechargeable lithium batteries |
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Authors: | Mihaela Baibarac Ioan BaltogSerge Lefrant Pedro Gomez-Romero |
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Affiliation: | a National Institute of Materials Physics, Lab. of Optical Process in Nanostructured Materials, P.O. Box MG-7, R-77125 Bucharest, Romania b Institut des Materiaux “Jean Rouxel”, 2 rue de la Houssiniere, B.P. 32229, F-44322 Nantes, France c Centre d’Investigacio en Nanociencia i Nanotecnologia, CIN2 (CSIC-ICN), Campus de la UAB, 08193 Bellaterra, Spain |
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Abstract: | Polydiphenylamine/single walled carbon nanotube (PDPA/SWNT) composites were synthesized electrochemically aiming at their application as active electrode materials for rechargeable lithium batteries. The electrochemical polymerization of diphenylamine (DPA) on a SWNT film immersed in a 1 M HCl solution was studied by cyclic voltammetry. Comparing cyclic voltammograms recorded on a blank Pt electrode with those obtained for a SWNT film deposited on Pt electrode one observes in the latter case a decrease of the DPA reduction potential. To elucidate electrochemical polymerization mechanism, photoluminescence studies on DPA/SWNT and PDPA/SWNT systems were carried out. Additional information concerning the functionalization process of SWNT with PDPA was obtained by Raman and IR spectroscopy. Using the PDPA/SWNT composite as active material for the positive electrode of a rechargeable lithium cell (LiPF6 electrolyte), the charge-discharge tests show a specific discharge capacity of ca. 245 mA h g−1, much higher than the 35 mA h g−1 for pure PDPA. |
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Keywords: | Carbon nanotubes Composites Raman Lithium batteries |
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