Hydrogenated V2O5 Nanosheets for Superior Lithium Storage Properties |
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| Authors: | Xiang Peng Xuming Zhang Lei Wang Liangsheng Hu Samson Ho‐Sum Cheng Chao Huang Biao Gao Fei Ma Kaifu Huo Paul K Chu |
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| Institution: | 1. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China;3. Department of Applied Biology and Chemical Technology, and the State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University, Hunghom, Kowloon, Hong Kong, China;4. The Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan, China;5. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong UniversityXi'an, Shanxi, China |
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| 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. |
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| Keywords: | 2D nanosheets hydrogenate lithium ion battery cathodes oxygen vacancy V2O5 |
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