【摘 要】
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Supercapacitor-like Na-ion batteries have attracted much attention due to the high energy density of batteries and power density of capacitors.Titanium dioxide
【机 构】
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State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University
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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.
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