Synthesis of hierarchical three-dimensional vanadium oxide microstructures as high-capacity cathode materials for lithium-ion batteries.
Synthesis of hierarchical three-dimensional vanadium oxide microstructures as high-capacity cathode materials for lithium-ion batteries.
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DOI：
10.1021/am3012593
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发表时间：
2012-07
影响因子：
9.5
通讯作者：
Anqiang Pan;H. Wu;Le Yu;Ting Zhu;X. Lou
中科院分区：
文献类型：
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作者：
Anqiang Pan;H. Wu;Le Yu;Ting Zhu;X. Lou
通过一种通用的无模板溶剂热法成功地合成了海胆状微花、纳米角状微球、纳米片状组装微花和纳米片束等层次化三维氧化钒微结构。结果表明，前驱体(VOC(2)O(4))溶液的浓度对产物的形貌有显著影响。作为例子，详细研究了海胆状氧化钒微花的相态和形貌随时间的演化。海胆状VO(2)微花可以在不使用任何表面活性剂的情况下在2 h内自组装。焙烧后的VO(2)微花很容易转变为海胆状的V(2)O(5)微结构。所制得的V(2)O(5)微花具有高度的渗透性，比表面积为33.64m(2)g(-1)。作为锂离子电池的正极材料，V(2)O(5)样品在300 mA g(-1)的电流密度下具有非常高的比放电容量267 mA h g(-1)。此外，它还表现出更好的循环稳定性。优异的电化学性能归功于多种有利的结构特征，包括纳米级的构建块、高孔隙率和三维分层微结构。
Hierarchical three-dimensional (3D) vanadium oxide microstructures, including urchin-like microflowers, nanohorn-structured microspheres, nanosheet-assembled microflowers, and nanosheets bundles, are successfully synthesized by a versatile template-free solvothermal method. It is found that the concentration of the precursor (VOC(2)O(4)) solution has a significant effect on the morphologies of the products. As an example, the time-dependent phase and morphology evolution for the urchin-like vanadium oxide microflowers has been investigated in detail. Urchin-like VO(2) microflowers can be self-assembled within 2 h without using any surfactants. After calcination, the VO(2) microflowers can be easily transformed to urchin-like V(2)O(5) microstructures. The as-obtained V(2)O(5) microflowers are highly porous with a specific surface area of 33.64 m(2) g(-1). When evaluated as a cathode material for lithium-ion batteries, the V(2)O(5) sample delivers very high specific discharge capacity of 267 mA h g(-1) at a current density of 300 mA g(-1). Further, it also exhibits improved cycling stability. The excellent electrochemical performance is attributed to multiple advantageous structural features, including the nanosized building blocks, high porosity, and the 3D hierarchical microstructures.