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Hydrogenated V 2 O 5 Nanosheets for Superior Lithium Storage Properties
Author(s) -
Peng Xiang,
Zhang Xuming,
Wang Lei,
Hu Liangsheng,
Cheng Samson HoSum,
Huang Chao,
Gao Biao,
Ma Fei,
Huo Kaifu,
Chu Paul K.
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201503859
Subject(s) - materials science , lithium (medication) , electrochemistry , energy storage , cathode , chemical engineering , diffusion , current density , electrode , hydrogen storage , anode , nanotechnology , composite material , chemistry , thermodynamics , engineering , endocrinology , quantum mechanics , medicine , power (physics) , physics , alloy
V 2 O 5 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 V 2 O 5 nanosheets prepared by hydrogenation at 200 °C with superior lithium storage properties are described. The hydrogenated V 2 O 5 (H‐V 2 O 5 ) 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‐V 2 O 5 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 V 2 O 5 materials which have large potential in energy storage and conversion applications.