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.

中文翻译：

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从聚合物复合材料前驱体合成 SnO2/TiO2 微带纤维及其在锂离子电池中的应用*

SnO ₂ /TiO _{2微带-纤维复合材料通过对SnO 2} /TiO ₂ /聚乙烯吡咯烷酮（PVP）前体纤维的离心纺丝和后续热处理成功合成。由不同比例的 SnO ₂与 TiO ₂组成的SnO ₂ /TiO ₂ /PVP 前体溶液通过将 2-乙基己酸锡 (II) 和丁醇钛 (IV) 与 PVP 在乙醇中混合来制备。SnO ₂ /TiO ₂ /PVP 混合物在空气中在 700°C 下进行热处理，导致形成 SnO ₂ /TiO ₂具有带状形态的微米级纤维。使用粉末 X 射线衍射、扫描电子显微镜 (SEM)/能量色散 X 射线光谱仪和 X 射线光电子能谱分析对材料的结构、形态和表面化学进行表征。SEM分析表明，SnO ₂ /TiO ₂复合纤维（3:2）具有微带形貌，表面有颗粒。该材料作为锂离子电池（LIBs）的负极材料进行了测试；复合纤维电极在 100 mA g ^{-1下提供 1200 mAh g -1}的初始容量。观察到容量降低至279 mAh g ^-170 次循环后；然而，样品保留了 99% 的库伦效率，这表明其具有良好的可逆性。由于高表面积和独特的结构，所合成的 SnO ₂ /TiO ₂复合纤维有望用于传感器和 LIB 应用。