• 文献标题:   Long-cycle stability for Li-S batteries by carbon nanofibers/reduced graphene oxide as host cathode material
  • 文献类型:   Article
  • 作  者:   LI ZY, ZOU YL, DUAN JL, LONG B, DU YY
  • 作者关键词:   carbon nanofiber, graphene, electrospinning, lis batterie
  • 出版物名称:   IONICS
  • ISSN:   0947-7047 EI 1862-0760
  • 通讯作者地址:   Xiangtan Univ
  • 被引频次:   0
  • DOI:   10.1007/s11581-019-02897-7
  • 出版年:   2019

▎ 摘  要

3D network structure of carbon nanofibers (CNF) chemically cross-linked with reduced graphene oxide (RGO) sheet was successfully prepared by electrospinning a dispersion of polyacrylonitrile (PAN) and graphene oxide (GO) sheets in dimethylformamide followed by heat treatment. Cathodes made with such composites after infused with sulfur (CNF-RGO/S) were able to deliver an initial reversible capacity of 730mAh/g and 378mAh/g after 500cycles at 0.1C. Even at a high rate of 5C, the CNF-RGO/S experienced the capacity of 227mAh/g and no capacity fade after 400cycles. In contrast, the capacity of an electrode without adding RGO decayed dramatically. The CNF matrix provides stable mechanical stability and shortens diffusion paths. The addition of RGO sheets increase the contact area with the electrolyte and speed up the reaction rate. These results demonstrate that the 3D network structure is of great potential as the cathode for long-cycle and high-rate rechargeable Li-S batteries.