Preparation and Characterization of Polypyrrole-Coated Silicon Nanoparticles
Silicon (Si) nanoparticles were stabilized by sodium dodecyl sulfate and poly(Nvinylpyrrolidone) in water, and coated with polypyrrole (PPy) via an in-situ polymerization of pyrrole with FeCl3. TEM images revealed that the Si nanoparticles were successfully coated with PPy (average thickness, ~2 nm). The Li/PPy-coated Si electrode exhibited improved discharge capacities, when compared to that of a reported Li/pure Si electrode. PPy-coatings on the Si nanoparticles acted as efficient conducting agents and prevented an extraction of the cracked Si fragments into the electrolyte to some extent.
Chang Kyu Rhee
H. S. La et al., "Preparation and Characterization of Polypyrrole-Coated Silicon Nanoparticles", Solid State Phenomena, Vol. 119, pp. 295-298, 2007