| 碳包覆CaSnO3纳米纤维作为高性能锂离子电池负极材料 |
| Carbon-Coated CaSnO3 Nanofibers as High Performance Anode Materials for Lithium Ion Batteries |
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| 摘要: 采用静电纺丝技术制备出CaSnO3纳米纤维（CaSnO3 NFs）并作为模板，再经表面原位聚合酚醛树脂和碳化处理制得碳包覆CaSnO3纳米纤维（CaSnO3@C NFs）。使用X射线衍射、扫描电子显微镜、透射电子显微镜和X射线光电子能谱对材料的物相组成、形貌和微观结构进行了表征，通过循环伏安、恒电流充放电和交流阻抗谱研究了碳包覆及碳化温度对CaSnO3 NFs负极材料电化学性能的影响。结果显示，碳包覆改性使CaSnO3 NFs的电化学性能得到较大程度的提高，而且随着碳化温度的升高，CaSnO3@C NFs复合电极的比容量先增加后下降，600℃碳化获得的CaSnO3@C NFs-600复合材料具有最好的电化学性能。在0.1 A·g-1的电流密度下，CaSnO3@C NFs-600电极的首圈放电比容量达到1 102.2 mAh·g-1，充放电循环100圈后比容量为548.8 mAh·g-1，当电流密度提高到2 A·g-1时，其比容量仍保持在333.5 mAh·g-1。 |
| 关键词: CaSnO3纳米纤维 碳包覆 静电纺丝 负极材料 储锂性能 |
| 基金项目: 福建省自然科学基金（No.2020J01393）资助。 |
| Abstract: Carbon coated CaSnO3 nanofibers (denoted as CaSnO3@C NFs) were prepared via the electrospinning technique combined with in-situ polymerization and carbonization processes. The phase compositions, surface morphology and microstructures of the samples were characterized by means of X-ray diffraction, scanning electron microscope, transmitting electron microscope and X-ray photoelectron spectroscopy. The influences of carbon coating and carbonization temperature on the electrochemical properties of CaSnO3 NFs-based anode materials were investigated using cyclic voltammetry, galvanostatic charge/discharge and AC impedance spectroscopy. The test results show that the electrochemical performance of CaSnO3 NFs was greatly improved after carbon coating, and meanwhile the specific capacity of CaSnO3@C NFs composites first increased and then decreased with increasing carbonization temperature, in which the CaSnO3@C NFs-600 composite obtained by carbonization at 600℃ exhibited an optimal electrochemical performance. The CaSnO3@C NFs-600 electrode had a high initial discharge specific capacity of 1 102.2 mAh·g-1 at a current density of 100 mA·g-1, and delivered a reversible specific capacity of 548.8 mAh·g-1 after 100 charge/discharge cycles. Moreover, it also showed a superior rate performance and retained a specific capacity of 333.5 mAh·g-1 even at 2 A·g-1. |
| Keywords: CaSnO3 nanofibers carbon coating electrospinning anode material lithium storage performance |
| 投稿时间：2020-12-01 修订日期：2021-01-30 |
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| 李小强,陈欣,李洪波,赵婷婷,张亚梅,向军,张开银.碳包覆CaSnO3纳米纤维作为高性能锂离子电池负极材料[J].无机化学学报,2021,37(4):700-708. |
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