Synthesis of hierarchical ZnV2O4 microspheres and its electrochemical properties
Synthesis of hierarchical ZnV2O4 microspheres and its electrochemical properties
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DOI：
10.1039/c4ce01445f
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发表时间：
2014-10
期刊：
影响因子：
3.1
通讯作者：
Cheng Zheng;Lingxing Zeng;Meilin Wang;Huiyan Zheng;Mingdeng Wei
中科院分区：
文献类型：
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作者：
Cheng Zheng;Lingxing Zeng;Meilin Wang;Huiyan Zheng;Mingdeng Wei
首次采用乙醇热还原路线合成了多级ZnV2O4微球，其中可以形成低价钒。通过 X 射线衍射 (XRD)、热重分析 (TG)、透射电子显微镜 (SEM/TEM) 和 N2 吸附-解吸测量对 ZnV2O4 微球进行表征。此外，该材料用作锂离子嵌入负极，表现出高可逆容量、高倍率性能和良好的循环稳定性。例如，在 100 mA g−1 的电流密度下，经过 280 个循环后，仍保持 638 mA h g−1 的高可逆容量。这些结果可能归因于分层ZnV2O4微球可以缓冲充放电循环过程中的应变和体积变化，并为锂离子存储提供更多位点和更短的锂离子扩散路径，从而提高容量和高倍率性能。
Hierarchical ZnV2O4 microspheres were synthesized using an ethanol thermal reduction route for the first time, in which vanadium with a low valence can be formed. ZnV2O4 microspheres were characterized by X-ray diffraction (XRD), thermogravimetric analysis (TG), transmission electron microscopy (SEM/TEM) and N2 adsorption–desorption measurements. Furthermore, this material was used as an anode for Li ion intercalation and exhibited high reversible capacity, high rate performance, and good cycling stability. For instance, a high reversible capacity of 638 mA h g−1 was maintained after 280 cycles at a current density of 100 mA g−1. These results might be attributed to the facts that hierarchical ZnV2O4 microspheres could buffer the strain and volume changes during the charge–discharge cycling process, and provide more sites for Li ion storage and a shorter path for Li ion diffusion, leading to improved capacity and high rate performance.