Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (03): 36-43.doi: 10.13475/j.fzxb.20200501508

Special Issue: Preparation of Nano-fiber and Its Application

• Fiber Materials • Previous Articles     Next Articles

Preparation and properties of Si/TiO2 composite carbon nanofibers

XING Yusheng1,2, HU Yi1,2(), CHENG Zhongling1,2   

  1. 1. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2020-05-08 Revised:2020-12-15 Online:2021-03-15 Published:2021-03-17
  • Contact: HU Yi E-mail:huyi-v@zstu.edu.cn

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Abstract:

In order to improve the morphology and structure of silicon/carbon nanofibers and enhance their energy storage performance, Si/TiO2/PAN nanofiber membranes was prepared though electrospinning of the ball milling Si/TiO2 powder and polyacrylonitrile(PAN), and then in an argon or hydrogen atmosphere carbonization treatment was carried out to obtain Si/TiO2 composite carbon nanofibers. The most suitable ratio of Si to TiO2 and carbonization temperature were optimized, the influence of fiber morphology, molecular structure, and element distribution on energy storage performance were analyzed. As a result, Si/TiO2 composite carbon nanofibers with good conductivity were prepared under the conditions of 1∶2 mass ratio between Si and TiO2 and 900 ℃ carbonization temperature. The fiber structure and the formed TiO2 disordered framework were able to ease effectively the volume expansion and agglomeration of silicon, significantly improving the capacity and cycle stability of lithium-ion batteries. At 0.2 mA/g current density and after 120 cycles, the discharge specific capacities of the composite carbon nanofibers prepared by argon and hydrogen carbonization were 942 and 1 212 mA·h/g, respectively. The work showed that the composite carbon nanofibers prepared through hydrogen carbonization have better rate performance.

Key words: composite carbon nanofibers, functional fiber, energy storage fiber, electrospinning, carbonization, ball milling mixing, electrochemical performance

CLC Number: 

  • TS195

Fig.1

SEM and TEM images of Si and TiO2 nanoparticles. (a) SEM image of Si nanoparticle; (b) SEM image of TiO2 nanoparticles; (c) TEM image of Si nanoparticle; (d) TEM image of TiO2 nanoparticles"

Fig.2

SEM images of Si/TiO2 composite carbon nanofibers with different mass ratios of Si and TiO2"

Fig.3

Energy storage performance of Si/TiO2 composite carbon nanofibers with different mass ratios of Si and TiO2"

Fig.4

SEM images of Si/TiO2composite carbon nanofibers with different carbonization temperatures"

Fig.5

XRD patterns and TEM images of Si/TiO2 composite carbon nanofibers prepared by carbonization under Ar atmosphere. (a) XRD pattern; (b) TEM images; (c) Selected area electron diffraction images"

Fig.6

Raman spectra of Si/TiO2 composite carbon nanofibers prepared by carbonization under Ar atmosphere. (a) Raman spectrum; (b) Partly enlarged view of Raman spectrum"

Fig.7

XPS spectra of Si/TiO2 composite carbon nanofibers prepared by carbonization under Ar atmosphere. (a) XPS spectrum; (b) O 1s spectrogram; (c) Ti 2p spectrogram"

Fig.8

SEM(a)and TEM(b)images of Si/TiO2 composite carbon nanofibers prepared by carbonization under H2 atmosphere"

Fig.9

Raman spectra of composite carbon nanofibers prepared by carbonization under H2 atmosphere. (a) Raman spectrum; (b) Partly enlarged view of Raman spectrum"

Fig.10

XPS spectrum of composite carbon nanofibers prepared by carbonization under H2 atmosphere. (a) XPS spectrum; (b) O 1s spectrogram;(c) Ti 2p spectrogram"

Fig.11

Thermogravimetric analysis curve of Si/TiO2 composite carbon nanofibers"

Fig.12

Electrochemical performance of Si/TiO2 composite carbon nanofibers prepared by carbonization in different atmospheres. (a)Energy storage performance curve (Ar); (b) Energy storage performance curve (H2); (c) Electrochemical impedance spectroscopy"

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