三维多级结构V_2O_5锂离子阴极材料的研究进展

Recent progress of three-dimensional hierarchical structure V_2O_5 Li ion cathode materials

针对V_2O_5材料电导率低和锂离子扩散动力性能差等缺点,通过元素掺杂、表面包覆和微观形貌调控等方法可以有效进行改善。相比于一维和二维结构材料,三维多级结构材料既有高比表面积,又由于有良好的自支撑性,而不容易发生团聚。利用不同合成方法将V_2O_5材料微纳米化,制成具有不同形貌的三维多级结构,材料表现出优良的电化学性能。综述不同形貌三维多级结构V_2O_5材料的合成方法、形成机理及电化学性能的研究进展,并着重介绍制备工艺与V_2O_5材料微观形貌以及V_2O_5材料微观形貌和电化学性能之间的关系。

In view of the low electric conductivity and the poor lithium-ion diffusion kinetics,the element doping,surface coating and microstructure controlling were demonstrated as an effective strategy to improve these problems.Compared to the one-dimensional and two-dimensional structures materials,the three-dimensional hierarchical structure materials have both high specific surface area,and are not prone to agglomeration because of its good self-supporting properties.The cathode materials V2O5,which possess different morphology three-dimensional hierarchical structure made by different synthetic methods,show excellent electrochemical performances.In this review,the new progress of the synthesis methods,the formation mechanism and the electrochemical performance of different morphology three-dimensional hierarchical structure V2O5 materials were summarized.And the relationship between the preparation process and microscopic morphology as well as between microscopic morphology and electrochemical properties was introduced.