| Fe(Ⅲ)掺杂Nb2O5微纳球的水热合成及其电化学性能 |
| Electrochemical Properties of Fe(Ⅲ)-Doped Nb2O5 Micro/nano Spheres via Hydrothermal Synthesis |
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| 摘要: 采用一步水热法合成Nb2O5和Fe（Ⅲ）掺杂的五氧化二铌微纳米球（Fe-Nb2O5），并利用X射线衍射（XRD）、扫描电子显微镜（SEM）及透射电子显微镜（TEM）等测试手段分别对其结构和形貌进行了表征。结果发现，所合成的Fe-Nb2O5和Nb2O5均为正交晶相，Nb2O5为尺寸分布在50~300 nm之间的形貌不规则颗粒，而Fe-Nb2O5是由约50 nm的一次颗粒自组装而成的直径约为1 μm的均匀微纳米球，即具有多级结构，其有利于增大电极材料与电解液的接触界面。电化学测试结果表明，Fe-Nb2O5的循环稳定性和倍率性能得到明显改善，在50 mA·g-1电流密度下，100次循环后放电容量仍保持在193.2 mAh·g-1，即使在5 A·g-1的电流密度下，容量仍可达到108.4 mAh·g-1。并分析了其性能改善的原因。 |
| 关键词: 锂离子电池 负极材料 五氧化二铌 掺杂 电化学性能 |
| 基金项目: 中央高校基本科研业务费专项资金（No.NS2016058）和江苏高校优势学科建设工程资助项目。 |
| Abstract: Fe(Ⅲ)-doped niobium oxide (Fe-Nb2O5) and Nb2O5 were prepared by the one-step hydrothermal route. Both samples were characterized by X-ray diffraction (XRD), electron microscopy(SEM), Transmission electron microscope(TEM) and so on. The results showed that Fe-Nb2O5 and Nb2O5 were orthorhombic phase. Nb2O5 was irregular particle with the wider size distribution of 50~300 nm, and Fe-Nb2O5 was homogeneous micro/nano sphere with the diameter of 1 μm, which assembled from 50 nm sized nano-particles The porous multistage structure could increase the contact interface between electrode materials and electrolyte. Electrochemical analyses showed that Fe-Nb2O5 has the better rate performance and cycle stability with a discharge capacity of 193.2 mAh·g-1 retained up to 100 cycles at 50 and 108.4 mAh·g-1 at 5 A·g-1, and the possible reasons were analyzed. |
| Keywords: Li-ion battery anode materials Nb2O5 doping electrochemical properties |
| 投稿时间：2016-03-28 修订日期：2016-08-19 |
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| 张迎霞,米常焕,李洪森.Fe(Ⅲ)掺杂Nb2O5微纳球的水热合成及其电化学性能[J].无机化学学报,2016,32(11):1905-1910. |
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