J. Mater. Sci. Technol. ›› 2021, Vol. 77: 169-177.DOI: 10.1016/j.jmst.2020.11.015

• Research Article • Previous Articles     Next Articles

Hollow multi-nanochannel carbon nanofiber/MoS2 nanoflower composites as binder-free lithium-ion battery anodes with high capacity and ultralong-cycle life at large current density

Xuepeng Nia,b, Zhe Cuia,b, Ning Jianga,b, Huifang Chena,b,c, Qilin Wua,b, Anqi Jua,b,c,*(), Meifang Zhua,b,c   

  1. aCollege of Materials Science and Engineering & Shanghai Collaborative Innovation Center for High Performance Fiber Composites, Donghua University, Shanghai, 201620, China
    bState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620, China
    cKey Laboratory of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai, 201620, China
  • Received:2020-07-03 Revised:2020-09-02 Accepted:2020-09-22 Published:2021-06-30 Online:2020-11-13
  • Contact: Anqi Ju
  • About author:* College of Materials Science and Engineering & Shanghai Collaborative Innovation Center for High Performance Fiber Composites, Donghua University, Shanghai, 201620, China. E-mail address: anqiju@163.com (A. Ju).

Abstract:

The electrode materials with high pseudocapacitance can enhance the rate capability and cycling stability of lithium-ion storage devices. Herein, we fabricated MoS2 nanoflowers with ultra-large interlayer spacing on N-doped hollow multi- nanochannel carbon nanofibers (F2-MoS2/NHMCFs) as freestanding binder-free anodes for lithium-ion batteries (LIBs). The ultra-large interlayer spacing (0.78∼1.11 nm) of MoS2 nanoflowers can not only reduce the internal resistance, but also increase accessible active surface area, which ensures the fast Li+ intercalation and deintercalation. The NHMCFs with hollow and multi-nanochannel structure can accommodate the large internal strain and volume change during lithiation/delithiation process, it is beneficial to improving the cycling stability of LIBs. Benefiting from the above combined structure merits, the F2-MoS2/NHMCFs electrodes deliver a high rate capability 832 mA h g-1 at 10 A g-1 and ultralong cycling stability with 99.29 and 91.60 % capacity retention at 10 A g-1 after 1000 and 2000 cycles, respectively. It is one of the largest capacities and best cycling stability at 10 A g-1 ever reported to date, indicating the freestanding F2-MoS2/NHMCFs electrodes have potential applications in high power density LIBs.

Key words: Carbon nanofibers, Electrospinning, MoS2, Freestanding, Lithium ion batteries