Preparation and Characterization of Polypyrrole-Coated Silicon Nanoparticles

Hyun Shil La; Joon Pyo Jeun; Jae Hak Choi; Phil Hyun Kang; Youn Sik Lee; Young Chang Nho

doi:10.4028/www.scientific.net/SSP.119.295

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Preparation and Characterization of Polypyrrole-Coated Silicon Nanoparticles

Abstract:

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.