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

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

*この研究の対応する著者

研究成果: Article査読

8 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)20610-20616
ページ数7
ジャーナルCeramics International
47
14
DOI
出版ステータスPublished - 2021 7月 15
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • プロセス化学およびプロセス工学
  • 表面、皮膜および薄膜
  • 材料化学

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