Two-Dimensional V2O5 Sheet Network as Electrode for Lithium-Ion Batteries

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• 作者：Yun Xu ; Marco Dunwell ; Ling Fei ; Engang Fu ; Qianglu Lin ; Brian Patterson ; Bin Yuan ; Shuguang Deng ; Paul Andersen ; Hongmei Luo ; Guifu Zou
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：November 26, 2014
• 年：2014
• 卷：6
• 期：22
• 页码：20408-20413
• 全文大小：341K
• ISSN：1944-8252

文摘

Two-dimensional V₂O₅ and manganese-doped V₂O₅ sheet network were synthesized by a one-step polymer-assisted chemical solution method and characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermal-gravimetric analysis, and galvanostatic discharge鈥揷harge analysis. The V₂O₅ particles were covered with thin carbon layers, which remained after decomposition of the polymer, forming a network-like sheet structure. This V₂O₅ network exhibits a high capacity of about 300 and 600 mA路h/g at a current density of 100 mA/g when it was used as a cathode and anode, respectively. After doping with 5% molar ratio of manganese, the capacity of the cathode increases from 99 to 165 mA路h/g at a current density of 1 A/g (鈭? C). This unique network structure provides an interconnected transportation pathway for lithium ions. Improvement of electrochemical performance after doping manganese could be attributed to the enhancement of electronic conductivity.

Keywords:

V₂O₅ network; manganese-doped; lithium-ion battery; polymer-assisted solution method; conductivity