• 文献标题:   Improved sodium storage properties of co-doped Na3V2(PO4)(2)F-3@graphene as anode material for sodium ion batteries
  • 文献类型:   Article
  • 作  者:   CAO J, WANG YF, CHEN YY, LI Z, DENG L, WU KY, WANG YL
  • 作者关键词:   sodiumion battery, anode, na3v2 po4 2 f3, graphene, rate capability
  • 出版物名称:   FERROELECTRICS
  • ISSN:   0015-0193 EI 1563-5112
  • 通讯作者地址:  
  • 被引频次:   3
  • DOI:   10.1080/00150193.2021.1984770
  • 出版年:   2021

▎ 摘  要

In this paper, Co-doped Na3V2-xCox(PO4)(2)F-3(x = 0,0.1,0.5,0.7) sodium ion battery anode material was prepared by one-step hydrothermal method, and Na3V1.5Co0.5(PO4)(2)F-3 anode material coated with graphene was also prepared. It is confirmed that moderate Co2+ doping can improve the electrochemical performance of NVPF. Among all samples, Na3V1.5Co0.5(PO4)(2)F-3@Graphene shows the best rate and cycle performance. It exhibits the highest specific capacity of 91.5 and 48.8 mAh/g at 1C, respectively when x = 0.5, after coating graphene, the charge-discharge specific capacities of 1C cycle are 128.2 mAh/g and 63.5 mAh/g for the first time, and 62.2 mAh/g and 45.1 mAh/g for 45 weeks.The performance results show that the excellent electrochemical performance of Na3V1.5Co0.5(PO4)(2)F-3@Graphene can be attributed to the increase in electronic conductivity and ion diffusion coefficient.