Sn-Doped V2O5 Film with Enhanced Lithium-Ion Storage Performance
Sn-Doped V2O5 Film with Enhanced Lithium-Ion Storage Performance
复制标题
具有增强锂离子存储性能的掺锡 V2O5 薄膜
DOI：
10.1021/jp406927m
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发表时间：
2013-11-14
影响因子：
3.7
通讯作者：
Cao, Guozhong
中科院分区：
文献类型：
--
作者：
Li, Yanwei;Yao, Jinhuan;Cao, Guozhong
Homogeneous Sn-doped V2O5 sol was prepared by the sol-gel method with H2O2, V2O5, and SnCl4 center dot 5H(2)O as precursors, and the films were fabricated by drop-casting, drying at ambient, and then annealing at 450 degrees C in air for 2 h. X-ray photoelectron spectroscopy (XPS) reveals that the Sn-doped V2O5 film contains 10% V4+ likely compensates with the accommodation of Sn4+ ions. Electrochemical and lithium-ion intercalation properties of both the pure and Sn-doped V2O5 films are systematically studied by means of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and chronopotentiometry (CP) tests. The Sn-doped V2O5 film shows much enhanced lithium-ion storage capacity, faster kinetics, and improved cyclic stability in comparison with pure V2O5 film. For example, after 50 cycles, the specific capacity of the Sn-doped V2O5 film retains 334 mAh g(-1) with a current density of 500 mA g(-1), much higher than 157 mAh g(-1) of the pure V2O5 film. Sn-doping is found to reduce the electrochemical reaction resistance, increase the electrochemical reaction reversibility, and enhance the lithium-ion diffusivity. The possible explanation for such significant enhancement in lithium-ion intercalation capacity and cyclic stability of the Sn-doped V2O5 film is discussed.
