Synthesis of Hierarchical Three-Dimensional Vanadium Oxide Microstructures as High-Capacity Cathode Materials for Lithium-Ion Batteries

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• 作者：Anqiang Pan ; Hao Bin Wu ; Le Yu ; Ting Zhu ; Xiong Wen (David) Lou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2012
• 出版时间：August 22, 2012
• 年：2012
• 卷：4
• 期：8
• 页码：3874-3879
• 全文大小：576K
• 年卷期：v.4,no.8(August 22, 2012)
• ISSN：1944-8252

文摘

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 (VOC₂O₄) 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 VO₂ microflowers can be self-assembled within 2 h without using any surfactants. After calcination, the VO₂ microflowers can be easily transformed to urchin-like V₂O₅ microstructures. The as-obtained V₂O₅ microflowers are highly porous with a specific surface area of 33.64 m² g^鈥?. When evaluated as a cathode material for lithium-ion batteries, the V₂O₅ sample delivers very high specific discharge capacity of 267 mA h g^鈥? at a current density of 300 mA g^鈥?. 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.

Keywords:

vanadium oxide; V₂O₅; VO₂; cathode; lithium-ion batteries