Superior Cathode of Sodium-Ion Batteries: Orthorhombic V2O5 Nanoparticles Generated in Nanoporous Carbon by Ambient Hydrolysis Deposition

被引：215

作者：

Raju, Vadivukarasi ^{[1
]}

Rains, Jordan ^{[1
]}

Gates, Cooper ^{[1
]}

Luo, Wei ^{[1
]}

Wang, Xingfeng ^{[1
]}

Stickle, William F. ^{[2
]}

Stucky, Galen D. ^{[3
]}

Ji, Xiulei ^{[1
]}

机构：

[1] Oregon State Univ, Dept Chem, Corvallis, OR 97331 USA

[2] Univ Calif Santa Barbara, Dept Chem & Biochem, Santa Barbara, CA 93117 USA

[3] Hewlett Packard Corp, Corvallis, OR 97330 USA

来源：

NANO LETTERS | 2014年 / 14卷 / 07期

基金：

美国国家科学基金会;

关键词：

Orthorhombic V2O5; sodium-ion batteries; pseudocapacitance; ambient hydrolysis deposition; HIGH-PERFORMANCE; VANADIUM-OXIDE; STORAGE MECHANISM; ENERGY-STORAGE; LITHIUM; ELECTRODES; NANOWIRES; NANOTUBES; CAPACITY; TIO2;

D O I：

10.1021/nl501692p

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

For the first time, we demonstrate that orthorhombic V2O5 can exhibit superior electrochemical performance in sodium ion batteries when uniformly coated inside nanoporous carbon. The encapsulated V2O5 shows a specific capacity as high as 276 mAh/g, while the whole nanocomposite exhibits a capacity of 170 mAh/g. The V2O5/C composite was fabricated by a novel ambient hydrolysis deposition that features sequential water vapor adsorption in nanoporous carbon, followed by a hydrolysis reaction, exclusively inside the nanopores. The unique structure of the nanocomposite significantly enhances the capacity as well as the rate performance of orthorhombic V2O5 where the composite retains a capacity of over 90 mAh/g at a current rate of 640 mA/g. Furthermore, by calculating, we also revealed that a large portion of the sodium-ion storage, particularly at high current rates, is due to the V2O5 pseudocapacitance.

引用

页码：4119 / 4124

页数：6

共 40 条

[1] Top-down fabrication of three-dimensional porous V2O5 hierarchical microplates with tunable porosity for improved lithium battery performance [J].