• 文献标题:   Reversible Na+-extraction/insertion in nitrogen-doped graphene-encapsulated Na3V2(PO4)(2)F-3@C electrode for advanced Na-ion battery
  • 文献类型:   Article
  • 作  者:   YANG XJ, WANG XL, ZHEN WZ
  • 作者关键词:   sodium storage property, cathode, na3v2 po4 2 f3@c, nitrogendoped graphene, naion battery
  • 出版物名称:   CERAMICS INTERNATIONAL
  • ISSN:   0272-8842 EI 1873-3956
  • 通讯作者地址:   Beihua Univ
  • 被引频次:   3
  • DOI:   10.1016/j.ceramint.2019.12.167
  • 出版年:   2020

▎ 摘  要

NASICON-structured sodium vanadium fluorophosphate has caused widespread concern for sodium energy conversion and storage because of its high voltage platform and high theoretical energy density. However, the inferior electrical conductivity is sill a big problem, which greatly prevent the applications of Na3V2(PO4)(2)F-3 material. Herein, the nitrogen-doped graphene-encapsulated Na3V2(PO4)(2)F-3@C (NG-NVPF@C) has been prepared using the sol-gel approach. The physical and electrochemical performances for the resulted NG-NVPF@C composite have been systematically characterized and compared with that of Na3V2(PO4)(2)F-3@C (NVPF@C) in this study. The electrochemical tests demonstrate that the as-fabricated NG-NVPF@C displays higher capacity, superior rate property and better cyclic life than NVPF@C. It displays the discharge capacity of 108.6 mAh at 5C. Moreover, it also possesses the high capacity of 101.6 mAh g(-1) at 10C over 300 cycles with the capacity retention of about 96.5%. The improved properties of NG-NVPF@C electrode are assigned to the constructed conducive network by nitrogen-doped graphene, which can modify the conductivity of Na3V2(PO4)(2)F-3.