Journal
ELECTROCHIMICA ACTA
Volume 292, Issue -, Pages 736-741Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.10.007
Keywords
Sodium-ion batteries; Cathode; Na3V2(PO4)(3); Blackberry-shaped structure
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Funding
- National Natural Science Foundation of China [21471162]
- Hunan Provincial Science and Technology Plan Project [2017TP1001]
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Na3V2(PO4)(3) is suitable for the rapid migration of Na+ in the electrochemical reaction process due to its open-ended structure of 3D sodium super ionic conductor type, but the low electronic conductivity and large volume deformation during the repeated Na+ extraction/insertion severely limit its rate and cycle performance. Herein, a blackberry-shaped Na3V2(PO4)(3) is synthesized for the first time to address both of the problems, and the structure is composed of aggregated carbon-coated nanoparticles attaching to highly conductive 3D porous carbon scaffolds, hence provides efficient pathways for both electrons and ions. For sodium-ion batteries, the blackberry-shaped Na3V2(PO4)(3) exhibits high reversible capacity (116 mA h g(-1) at 0.2 C), high-rate performance (83 mA h g(-1) at 20 C) and long-life stability (94.4% capacity retention after 4500 cycles at 10 C). The excellent electrochemical performance indicates that blackberry-shaped Na3V2(PO4)(3) has better application prospects as an advanced cathode material for sodium-ion batteries. (C) 2018 Elsevier Ltd. All rights reserved.
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