J. Mater. Sci. Technol. ›› 2022, Vol. 100: 101-109.DOI: 10.1016/j.jmst.2021.05.048

• Research Article • Previous Articles     Next Articles

Carbon-coated MoS2 nanosheets@CNTs-Ti3C2 MXene quaternary composite with the superior rate performance for sodium-ion batteries

Fengyi Hea, Cheng Tangb, Yadong Liua, Haitao Lia, Aijun Dub,*(), Haijiao Zhanga,*()   

  1. aInstitute of Nanochemistry and Nanobiology, Shanghai University, Shanghai 200444, China
    bSchool of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, QLD 4001, Australia
  • Received:2021-04-08 Revised:2021-05-27 Accepted:2021-05-27 Published:2022-02-20 Online:2022-02-15
  • Contact: Aijun Du,Haijiao Zhang
  • About author:hjzhang128@shu.edu.cn (H. Zhang).
    *E-mail addresses: aijun.du@qut.edu.au (A. Du),
    First author contact:

    1 These authors contributed equally to this work.

Abstract:

The exploration of advanced MoS2-based electrode materials overcoming their inherent low conductivity and large volume changes is of importance for next-generation energy storage. In this work, we report a simple and high-efficient one-pot hydrothermal approach to prepare a unique and stable 1D/2D heterostructure. In the architecture, ultrathin carbon layer-coated MoS2 nanosheets with large expanded interlayer of 1.02 nm are vertically grown onto the Ti3C2 MXene and cross-linked carbon nanotubes (CNTs), giving rise to a highly conductive 3D network. The interlayer expanded MoS2 nanosheets can greatly facilitate the Na ions/electrons transmission. Meanwhile, the N-doped 1D/2D CNTs-Ti3C2 matrix can be used as a strong mechanical support to well relieve the large volume expansion upon cycles. As a combination result of several advantages, the developed quaternary C-MoS2/CNTs-Ti3C2 composite anode shows an excellent sodium storage performance (562 mA h g-1 at 100 mA g-1 after 200 cycles) and rate capability (475 mA h g-1 at 2000 mA g-1). The density functional theory calculations further prove that the full combination of layer-expanded MoS2 nanosheets and N-doped Ti3C2 matrix can significantly enhance the adsorption energy of Na ions, further resulting in the enhancement of sodium storage capabilities.

Key words: MoS2 nanosheets, Ti3C2 MXene, Quaternary composite, Nitrogen doping, Sodium-ion batteries