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 language | English |
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Pages (from-to) | 38-46 |
Number of pages | 9 |
Journal | Journal of Energy Chemistry |
Volume | 59 |
Early online date | 18 Nov 2020 |
DOIs | |
Publication status | Published - Aug 2021 |
Keywords
- Carbon nanotubes
- Interwoven scaffold
- Na-ion battery
- Supercapacitor-like
- TiO
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Physical Chemistry and characterization(PC2)
Johan Wouters (Manager) & Carmela Aprile (Manager)
Technological Platform Physical Chemistry and characterizationFacility/equipment: Technological Platform