徐常蒙, 孙洪冉, 李海昌, 韩晓蕾, 王晓君, 何燕, 刘治明. Bi/Bi2O3复合碳纳米纤维的制备及其储锂性能研究[J]. 华南师范大学学报(自然科学版), 2022, 54(3): 34-42. doi: 10.6054/j.jscnun.2022042
引用本文: 徐常蒙, 孙洪冉, 李海昌, 韩晓蕾, 王晓君, 何燕, 刘治明. Bi/Bi2O3复合碳纳米纤维的制备及其储锂性能研究[J]. 华南师范大学学报(自然科学版), 2022, 54(3): 34-42. doi: 10.6054/j.jscnun.2022042
XU Changmeng, SUN Hongran, LI Haichang, HAN Xiaolei, WANG Xiaojun, HE Yan, LIU Zhiming. The Preparation of Bi/Bi2O3 Composite Carbon Nanofiber and Its Lithium Storage Performance[J]. Journal of South China Normal University (Natural Science Edition), 2022, 54(3): 34-42. doi: 10.6054/j.jscnun.2022042
Citation: XU Changmeng, SUN Hongran, LI Haichang, HAN Xiaolei, WANG Xiaojun, HE Yan, LIU Zhiming. The Preparation of Bi/Bi2O3 Composite Carbon Nanofiber and Its Lithium Storage Performance[J]. Journal of South China Normal University (Natural Science Edition), 2022, 54(3): 34-42. doi: 10.6054/j.jscnun.2022042

Bi/Bi2O3复合碳纳米纤维的制备及其储锂性能研究

The Preparation of Bi/Bi2O3 Composite Carbon Nanofiber and Its Lithium Storage Performance

  • 摘要: 为提高Bi负极材料的循环性能,提出了一种Bi/Bi2O3碳纳米复合纤维(Bi/Bi2O3-CNFs)的合成方法。以Bi2S3纳米棒为模板,采用静电纺丝技术及后续高温热处理方法成功合成了具有纵孔结构的Bi/Bi2O3(w)-CNFs。采用扫描电子显微镜(SEM)、X射线衍射(XRD)、热重分析(TGA)、透射电子显微镜(TEM)和X-射线光电子能谱(XPS)对复合材料进行了表征。讨论了不同质量分数的Bi2S3对复合材料结构以及电化学性能的影响。结果表明:当添加8.7%(质量分数)的Bi2S3时,合成的Bi/Bi2O3(8.7%)-CNFs拥有最佳的电化学储锂性能。当充放电电流密度为0.1 A/g时,Bi/Bi2O3(8.7%)-CNFs复合材料首次放电比容量可达到806 mA·h/g,并能稳定循环1 000次,即使在5.0 A/g的大电流密度下,储锂容量仍有147 mA·h/g。Bi/Bi2O3(8.7%)-CNFs复合结构改善了充放电过程的动力学性能,提高了电化学性能。碳纤维及内部纵孔结构缓解了充放电过程中电极材料的体积膨胀,增强了电池的循环稳定性。

     

    Abstract: In order to improve the cycling performance of Bi anode materials, a method of synthesizing Bi/Bi2O3 carbon nanocomposite fibers (Bi/Bi2O3(w)-CNFs) was proposed. Bi/Bi2O3(w)-CNFs with longitudinal pore structure were successfully synthesized using Bi2S3 nanorods as templates based on the electrospinning technique and subsequent high-temperature heat treatment. The composites were characterized with scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The effects of mass fraction of Bi2S3 on the structure and electrochemical properties of the composites were discussed. The results showed that the synthesized Bi/Bi2O3(8.7%)-CNFs possessed the best lithium storage performance when 8.7%(mass fraction) of Bi2S3 was added. At a current density of 0.1 A/g, the Bi/Bi2O3(8.7%)-CNFs composites could reach 806 mA·h/g in the first cycle and be stably cycled for 1 000 cycles. Even at a high current density of 5.0 A/g, the lithium storage capacity was still 147 mA·h/g. The structure of Bi/Bi2O3(8.7%)-CNFs improved the kinetic performance during charging and discharging, and enhanced the electrochemical performance. The carbon fiber and the internal longitudinal tunnel structure alleviated the volume expansion of the electrode material during the charging and discharging process and enhanced the cycling stability of the battery.

     

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