Free-standing vanadium pentoxide nanoribbon film as a high-performance cathode for rechargeable sodium batteries |
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| Authors: | Yi Sun Xin Liang Hongfa Xiang Yan Yu |
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| Institution: | a Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices, School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
b Key Laboratory of Materials for Energy Conversion Chinese Academy of Sciences, Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | Vanadium pentoxide (V2O5·nH2O) nanoribbons are synthesized via a hydrothermal process. These ribbons are 20 nm thick, 200 nm to 1 mm wide and several tens of micrometers long. Free-standing binder-free films are prepared by using these nanoribbons with multi-walled carbon nanotubes (MWCNTs) and used as the cathode for rechargeable sodium batteries. The large interlayer space between the V2O5 bilayers can enhance the kinetics of sodium ion intercalation/deintercalation. In addition, the intertwining network of the V2O5·0.34H2O film provides efficient electron conduction pathways and shortens diffusion distances of sodium ion. The electrochemical tests prove that the freestanding V2O5·0.34H2O film cathode delivers high reversible specific capacities (190 mAh/g) and good cycling stabilities (170 mAh/g after 150 cycles) in the voltage range between 1.5 V and 3.5 V. |
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| Keywords: | Vanadium pentoxide Cathode Free-standing electrode Rechargeable sodium batteries |
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