研究目的
To investigate the synergistic effect of specific surface area and nitrogen doping content of composite materials on the electrochemical performance as anode materials for lithium ion batteries.
研究成果
The controllable doping of nitrogen and synchronous introduction of pores into the composites are achieved by a simple method of DIPA addition. The electrochemical performance of S1-S3 added with DIPA has been significantly improved compared with S0. The S2 presents the highest specific capacity among four samples due to the synergistic effects of nitrogen doping and increased surface area.
研究不足
The technical and application constraints of the experiments, as well as potential areas for optimization, are not explicitly mentioned in the abstract.
1：Experimental Design and Method Selection:
The carbon nanofibers loaded with titanium dioxide are fabricated via electrospinning method followed by calcination process with simple addition admixture of diisopropyl azodiformate in precursor solution.
2：Sample Selection and Data Sources:
Different weight of DIPA (0 g, 3 g, 5 g and 7 g denoted as S0, S1, S2 and S3, respectively) is mingled with
3：9 g TiO2 nanoparticles (anatase phase). List of Experimental Equipment and Materials:
Field emission scanning electron microscope (FESEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) system, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectra, nitrogen adsorption/desorption isotherms.
4：Experimental Procedures and Operational Workflow:
The preparation process of freestanding TiO2@CNFs is described as follows: Different weight of DIPA is mingled with TiO2 nanoparticles with the help of ultrasonic and magnetic stirring. Meanwhile, polyacrylonitrile powder (PAN) was dispersed in N, N- dimethylformamide to form a solution of 12% (mass concentration). Then, aforementioned two solutions are mixed uniformly via magnetic stirring for another 6 h, and nanofiber membrane is produced via electrospinning method. The obtained membrane is oxidized in air at 280 °C and then sintered at 800 °C under argon atmosphere with the rising step of 5 °C.
5：Data Analysis Methods:
The electrochemical performance of the samples is measured by CR2032 coin-type cells. The flexible films are used as electrodes without conductive and binder materials.
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Field emission scanning electron microscope
FESEM
To investigate the microstructure of all the four samples.
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Transmission electron microscopy
TEM
To investigate the microstructure of all the four samples.
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Energy dispersive X-ray spectroscopy
EDX
To record the element distributions.
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X-ray diffraction
XRD
Bruker D8 Discover
To measure the crystalline form.
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X-ray photoelectron spectroscopy
XPS
ESCA
To determine the chemical states of element.
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Raman spectra
LABRAM-HR Confocal Laser Micro-Raman spectrometer
To investigate the structural characters of the samples.
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Nitrogen adsorption/desorption isotherms
Quadrasorb SI sorption analyzer
To calculate the specific surface area based on the adsorption branch of nitrogen adsorption/desorption isotherms.
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CR2032 coin-type cells
To measure the electrochemical performance of the samples.
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Electrochemical workstation
CHI660
To depict the cyclic voltammetry (CV) curves at various scan rates.
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