• 文献标题:   Novel design and preparation of N-doped graphene decorated Na3V2(PO4)(3)/C composite for sodium-ion batteries
  • 文献类型:   Article
  • 作  者:   LIU HX, GUO Y
  • 作者关键词:   sodiumion batterie, na3v2 po4 3, carbon coating, nitrogendoped graphene, electrochemical property
  • 出版物名称:   SOLID STATE IONICS
  • ISSN:   0167-2738 EI 1872-7689
  • 通讯作者地址:   Shanxi Datong Univ
  • 被引频次:   9
  • DOI:   10.1016/j.ssi.2017.04.015
  • 出版年:   2017

▎ 摘  要

N-doped graphene (N-graphene) has been a very powerful tool to tailor the property of the pure graphene and it has been proved to be an excellent conducting matrix for preparing high-rate sodium-ion batteries. In this work, we design a facile and rapid route to fabricate the advanced cathode in which the carbon-coated Na3V2(PO4)(3) nanocrystals are wrapped on the surface of N-graphene (Na3V2(PO4)(3)/C@N-graphene). The highly conducting N-graphene sheets significantly enhance the electrochemical performance of the composite, which presents excellent high-rate capability and long-cycle stability. The initial specific capacity of the composite can be up to 115.2 mAh g(-1) at 0.1 C between 2.5 and 3.8 V, which is approximately 97.6% of the theoretical capacity. Moreover, the composite shows a long-cycle performance exceeding 1000 cycles at high rate of 15 C and a high capacity retention ratio. These superior electrochemical properties could be ascribed to many reasons, including the superior electronic conductivity of N-graphene matrix and the nanosized Na3V2(PO4)(3)/C particles, which are helpful for the transport of e(-) and Na+. The results demonstrate that the Na3V2(PO4)(3)/C@N-graphene is a promising candidate to be used in sodium-ion batteries.