Synthesis of SnO2/TiO2 micro belt fibers from polymer composite precursors and their applications in Li-ion batteries*

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SnO2/TiO2 micro belt–fiber composites were successfully synthesized using centrifugal spinning and subsequent heat treatment of SnO2/TiO2/polyvinylpyrrolidone (PVP) precursor fibers. SnO2/TiO2/PVP precursor solutions consisting of different ratios of SnO2 to TiO2 were prepared by mixing Tin (II) 2-ethylhexanoate and titanium (IV) butoxide with PVP in ethanol. The SnO2/TiO2/PVP mixture was heat treated in air at 700°C, which resulted in the formation of SnO2/TiO2 micron-sized fibers with a belt-shaped morphology. Structural, morphology, and surface chemistry characterization of the materials was performed using powder X-ray diffraction, scanning electron microscopy (SEM)/energy-dispersive X-ray spectrometer, and X-ray photoelectron spectroscopy analyses. SEM analysis showed the SnO2/TiO2 composite fibers with (3:2) ratio had a micro belt morphology with particles on the surface. The material was tested as an anode material for lithium-ion batteries (LIBs); the composite fiber electrode delivered an initial capacity of 1200 mAh g−1 at 100 mA g−1. The capacity was observed to decrease to 279 mAh g−1 after 70 cycles; however, the sample retained a columbic efficiency of 99%, which indicated good reversibility. Due to the high surface area and unique structure, the as-synthesized SnO2/TiO2 composite fibers may be promising for sensor and LIB applications.


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Journal of Polymer Science