Preparation and sodium storage application of one-dimensional porous TiO2@carbon nanofibers composite
One-dimensional porous titanium dioxide@carbon nanofibers(P-TiO2@CNFs)composite with a lamellar branch structure was prepared by in situ electrospinning and concentrated alkali hydrothermal etching methods,and then employed as the anode material of sodium-ion batteries.The lamellar branching structure could effectively shorten the ion diffusion pathway and increase the contact area between electrolyte and active material.The porous structure provided more reactive sites,thus accelerating the charge transfer kinetics.Finally,the chemical bonding between TiO2 and carbon nanofibers could reinforce the structural stability of the composites.The surface morphology,microstructure,crystal structure,specific surface area,pore size and valence state of P-TiO2@CNFs were analyzed.The galvanostatic charge and discharge measurements and rate performance tests were performed on the NEWARE battery test system.The experimental results demonstrated that P-TiO2@CNFs exhibited excellent reversible capacity of 197mAh/g at 2.0A/g after 2000 cycles,and high specific capability of 61.7mAh/g at an ultrahigh current density of 30.0A/g.
electrospinningtitanium dioxideporous structurechemical bondsodium ion battery
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