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Title: Hydrogenated V2O5 nanosheets for superior lithium storage properties
Authors: Peng, X
Zhang, X
Wang, L
Hu, L
Cheng, SHS
Huang, C
Gao, B
Ma, F
Huo, K
Chu, PK
Keywords: 2D nanosheets
Lithium ion battery cathodes
Oxygen vacancy
Issue Date: 2016
Publisher: Wiley-VCH
Source: Advanced functional materials, 2016, v. 26, no. 5, p. 784-791 How to cite?
Journal: Advanced functional materials 
Abstract: V2O5 is a promising cathode material for lithium ion batteries boasting a large energy density due to its high capacity as well as abundant source and low cost. However, the poor chemical diffusion of Li+, low conductivity, and poor cycling stability limit its practical application. Herein, oxygen-deficient V2O5 nanosheets prepared by hydrogenation at 200 °C with superior lithium storage properties are described. The hydrogenated V2O5 (H-V2O5) nanosheets deliver an initial discharge capacity as high as 259 mAh g-1 and it remains 55% when the current density is increased 20 times from 0.1 to 2 A g-1. The H-V2O5 electrode has excellent cycling stability with only 0.05% capacity decay per cycle after stabilization. The effects of oxygen defects mainly at bridging O(II) sites on Li+ diffusion and overall electrochemical lithium storage performance are revealed. The results reveal here a simple and effective strategy to improve the capacity, rate capability, and cycling stability of V2O5 materials which have large potential in energy storage and conversion applications. Oxygen-deficient V2O5 nanosheets with pre-compressed stress are prepared by low-temperature hydrogenation. The H-V2O5 nanosheets possess superior electrochemical properties, such as high capacity, improved conductivity, reduced stress in Li+ insertion/depletion, and <0.05% decay per cycle after stabilization, as a result of the generation of the proper amount of oxygen defects at O(II) sites.
ISSN: 1616-301X
DOI: 10.1002/adfm.201503859
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