Mg2+-doped Na3V2(PO4)3/C decorated with graphene sheets: An ultrafast Na-storage cathode for advanced energy storage |
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| Affiliation: | 1. College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400067, PR China;2. Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, PR China;1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui 230026, China;2. Key Lab of Theory and Technology for Advanced Batteries Materials, College of Engineering, Peking University, Beijing 100871, China;1. School of Materials Science and Engineering, Jiangsu Collaborative Innovation Center of Photovolatic Science and Engineering, Changzhou University, Changzhou, 213164, China;2. Hunan Province Cooperative Innovation Center for the Construction & Development of Dongting Lake Ecological Economic Zone, College of Chemistry and Materials Engineering, Hunan University of Arts and Science, Changde, 415000, China;3. College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China;4. Key Laboratory of Preparation and Application of Environmental Friendly Materials (Jilin Normal University), Ministry of Education, Changchun, 130103, China;5. Micro/Nano Science and Technology Center, Jiangsu University, Zhenjiang, 212013, China |
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| Abstract: | NASICON-type Na3V2(PO4)3 is one of the most promising cathode materials for sodium-ion batteries, delivering about two Na+-ions extraction/insertion from/into the unit structure. However, the low electronic conductivity which leads to bad rate capability and poor cycle performance, limits its practical application for sodium-ion batteries. To overcome the kinetic problem, we attempt to prepare the carbon-coated Na3V2(PO4)3 nanocrystals further decorated by graphene sheets and doped with Mg2+ ion via the two steps of sol-gel process and solid-state treatment for the first time. Such architecture synergistically combines the advantages of two-dimensional graphene sheets and 0-dimensional Mg2+-doped Na3V2(PO4)3/C nanoparticles. It greatly increases the electron/Na+-ion transport kinetics and assures the electrode structure integrity, leading to attractive electrochemical performance. When used as sodium-ion batteries cathode, the hybrid composite delivers an initial discharge capacity of 115.2 mAh g−1 at 0.2 C rate, and retains stable discharge capacities of 113.1, 109.0, 102.4, 94.0 and 85.2 mAh g−1 at high current rates of 1, 2, 5, 10 and 20 C rate, respectively. Thus, this nanostructure design provides a promising pathway for developing high-performance Na3V2(PO4)3 material for sodium-ion batteries. |
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| Keywords: | Sodium-ion batteries Graphene sheets High-rate performance Cathode material |
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