N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres with pseudocapacitive behaviour for ultrahigh power sodium-ion batteries

Ke Sun, Yuebo Hu, Xudong Zhang, Kwan San Hui, Keliang Zhang, Guogang Xu, Jingyun Ma, Wen He

Research output: Contribution to journalArticle

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Abstract

The development of sodium-ion batteries with high power density is highly challenging yet critically important in many applications. Herein, we develop sodium-ion batteries with ultrahigh power density by using N-doped hard/soft double-carbon-coated Na3V2(PO4)3 hybrid-porous microspheres as a cathode. A higher working potential of 3.4 V, superior rate capability (93 mA h g−1 at 10C, 81 mA h g−1 at 30C) as well as stable cycling performance (72.9% capacity retention at 10C after 1000 cycle) are simultaneously achieved. Very impressively, it can deliver pseudocapacitive behavior and a practical energy density of 317 W h kg−1 at a power density of 194 W kg−1, which also remains 73.5 W h kg−1 even at an ultrahigh power density of 12600 W kg−1. The superior performances can be ascribed to the hybrid-porous microsphere structure, which provide favorable kinetics for bath electron and Na+, large cathode-electrolyte contact area, as well as robust structural integrity. This design provides a promising pathway for developing low-cost sodium-ion batteries with high energy density as well as high power density.
Original languageEnglish
Article number135680
Number of pages12
JournalElectrochimica Acta
Volume335
Early online date14 Jan 2020
DOIs
Publication statusPublished - 1 Mar 2020

Keywords

  • High energy density
  • Hybrid-porous microspheres
  • N-doped hard/soft double-carbon-coated
  • Na V (PO )
  • Ultrahigh power density
  • STORAGE
  • ELECTRODE MATERIAL
  • Na3V2(PO4)(3)
  • CATHODE MATERIAL
  • LITHIUM-ION
  • CYCLING STABILITY
  • HOLLOW SPHERES
  • RATE CAPABILITY
  • ELECTROCHEMICAL PERFORMANCE
  • LIFE
  • RATIONAL DESIGN

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