Hydrogenated V2O5 Nanosheets for Superior Lithium Storage Properties

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Xuming Zhang
  • Lei Wang
  • Liangsheng Hu
  • Chao Huang
  • Biao Gao
  • Fei Ma
  • Kaifu Huo

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)784-791
Journal / PublicationAdvanced Materials for Optics and Electronics
Volume26
Issue number5
Publication statusPublished - 2 Feb 2016

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

Research Area(s)

  • 2D nanosheets, hydrogenate, lithium ion battery cathodes, oxygen vacancy, V2O5

Citation Format(s)

Hydrogenated V2O5 Nanosheets for Superior Lithium Storage Properties. / Peng, Xiang; Zhang, Xuming; Wang, Lei; Hu, Liangsheng; Cheng, Samson Ho-Sum; Huang, Chao; Gao, Biao; Ma, Fei; Huo, Kaifu; Chu, Paul K.

In: Advanced Materials for Optics and Electronics, Vol. 26, No. 5, 02.02.2016, p. 784-791.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal