Electrochemical Performance of Sn/SnO_2 Nanoparticles Encapsulated in Carbon Matrix Derived from Plant Polysaccharides

摘要

Carbon-tin nanocomposites were obtained in one step pyrolysis and carboreduction process. The nanomaterial precursors were prepared using a novel method, based on coating of tin precursor by a plant polysaccharide in a sol-gel polycondensation process. The developed method provided formation of tin-based nanograins encapsulated in a carbon buffer matrix. Optimal conditions of the thermal treatment were determined by thermal analysis methods (EGA-TGA). The materials were investigated by X-ray diffraction (XRD) and transmission electron microscopy (TEM). Comprehensive electrochemical characterization of obtained nanocomposites, including cyclic voltammetry (CV) and impedance spectroscopy (IS), was carried out. Discharge - charge tests were performed in R2032-type coin cells within 0.01÷1.5 V potential range.