Interwoven scaffolded porous titanium oxide nanocubes/carbon nanotubes framework for high-performance sodium-ion battery

Wen Bei Yu, Wen Da Dong, Chao Fan Li, Nasiruddin Macadam, Jiu Xiang Yang, Guo Bin Zhang, Zhi Yi Hu, Tien Chun Wu, Yu Li, Tawfique Hasan, Li Hua Chen, Li Qiang Mai, Bao Lian Su

Research output: Contribution to journalArticlepeer-review

Abstract

Supercapacitor-like Na-ion batteries have attracted much attention due to the high energy density of batteries and power density of capacitors. Titanium dioxide (TiO2), is a promising anode material. Its performance is however seriously hindered by its low electrical conductivity and the sluggish diffusion of sodium ions (Na+) in the TiO2 matrix. Herein, this work combines porous TiO2 nanocubes with carbon nanotubes (CNTs) to enhance the electrical conductivity and accelerate Na+ diffusivity for Na-ion batteries (NIBs). In this composite, an interwoven scaffolded TiO2/CNTs framework is formed to provide abundant channels and shorter diffusion pathways for electrons and ions. The in-situ X-ray diffraction and cyclic voltammetry confirm the low strain and superior transport kinetics in Na+ intercalation/extraction processes. In addition, the chemically bonded TiO2/CNTs hybrid provides a more feasible channel for Na+ insertion/extraction with a much lower energy barrier. Consequently, the TiO2/CNTs composite exhibits excellent electrochemical performance with a capacity of 223.4 mAh g−1 at 1 C and a capacity of 142.8 mAh g−1 at 10 C (3.35 A g−1). The work here reveals that the combination of active materials with CNTs can largely improve the utilization efficiency and enhance their sodium storage.

Original languageEnglish
Pages (from-to)38-46
Number of pages9
JournalJournal of Energy Chemistry
Volume59
Early online date18 Nov 2020
DOIs
Publication statusPublished - Aug 2021

Keywords

  • Carbon nanotubes
  • Interwoven scaffold
  • Na-ion battery
  • Supercapacitor-like
  • TiO

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