Sandwich-like N-doped carbon nanotube@Nb2C MXene composite for high performance alkali ion batteries

Wenyang Zhang, Huixin Jin, Guowen Chen, Jianxin Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Sodium (Na) and potassium (K) ion batteries are promising for the next-generation energy storage equipment, but compared with lithium (Li) ion battery, their requirements for suitable host materials are much tougher, due to their large ions. 2D accordion-like MXene materials have been studied a lot as electrode materials for Na/K ion battery for their vast interlamellar spacing, but they suffer from layers’ restacking. Herein, a sandwich-like N-doped carbon nanotube@Nb2C (N-CNT@Nb2C) has been synthesized, where N-CNT fibers are sandwiched between MXene layers to fix the whole structure, enhance electrical conductivity, and increase interlamellar spacing. After nitrogen doping, carbon nanotubes own higher conductivity and sites to penetrate N-CNT walls. Consequently, N-CNT@Nb2C shows excellent electrochemical performance in Li, Na, K batteries, such as steady cycling performance for more than 500 cycles. We also test its performance with liquid K–Na alloy as anode of K ion battery. Due to the dendrite-free character of liquid anode, it exhibits better electrochemical performance than with solid K anode. The N-CNT@Nb2C promotes the finding of more suitable electrode materials for alkali ion batteries, deepens understanding of their inner mechanisms, and facilitates their commercialization.

Original languageEnglish
Pages (from-to)20610-20616
Number of pages7
JournalCeramics International
Issue number14
Publication statusPublished - 2021 Jul 15
Externally publishedYes


  • Alkali ion batteries
  • High performance
  • Liquid K–Na alloy
  • NbC MXene
  • Nitrogen-doped carbon nanotube

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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