期刊
NANO ENERGY
卷 22, 期 -, 页码 583-593出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2016.03.001
关键词
V2O5 nanobelts; Ambient-condition synthesis; Large-scale production; Density functional theory; Li-ion batteries; Na-ion batteries
类别
资金
- Research Council of Norway [221469]
- Singapore National Research Foundation under CREATE program: EMobility in Megacities, Environment and Water Industry Programme Office under the National Research Foundation of Singapore [MEWR651/06/160]
Large-scale preparation of single-crystalline V2O5 nanobelts is successfully demonstrated with a simple solution treatment process under ambient condition using commercial V2O5 powders as the precursor. Unlike the commonly recognized Ostwald ripening process that involves the dissolution of small crystals and the redeposition of the dissolved species on the more energetically favored large particles, this preparation shows that the reaction mechanism of our method follows a different route, in which the large commercial V2O5 powders (1-4 mu m) dissolve in the solution and eventually transform into V2O5 nanobelts with lengths up to several tens of micrometers, widths of 5-50 nm, and thicknesses of only 5 nm. The density function theory (DFT) calculation indicates that the preferential growth of V2O5 nanobelts along the [010] direction is attributed to the anisotropic bonding of V2O5 layered structure resulting in the fastest nucleation rate at the V2O5(010) surface. These nanobelts possess a remarkably large surface area, which is about 14 times higher than that of the V2O5 precursor. Binder-free bulky papers can be prepared by the intertwining V2O5 nanobelts with the acid-treated multi-walled carbon nanotubes. When the V2O5 nanobelts are applied as the cathodes in lithium-ion batteries (LIBs) and sodium-ion batteries (SIBS), such robust and flexible electrodes demonstrate superior lithium and sodium storage performances at fast charge/discharge rates, delivering 144 mA h g(-1) at 20 C in LIBs and 61 mA h g(-1) at 10 C in SIBS respectively. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据