Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (11): 10-18.doi: 10.13475/j.fzxb.20191106709

• Fiber Materials • Previous Articles     Next Articles

Preparation and energy storage of porous carbon nanofibers based on ZnCo2O4

WANG Zixi1,2, HU Yi1,2()   

  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:2019-11-28 Revised:2020-07-11 Online:2020-11-15 Published:2020-11-26
  • Contact: HU Yi E-mail:huyi-v@zstu.edu.cn

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Abstract:

Aiming at the problem of rapid capacity decay during the cycling of lithium-sulfur batteries, ZnCo2O4 nanoparticles were prepared by a hydrothermal method, and the nanoparticles were mixed with polyacrylonitrile to prepare composite nanofibers by electrostatic spinning followed by carbonization. Scanning electron microscope, transmission electron microscope, X-ray photoelectron spectroscopy, raman spectroscopy, and specific surface area measurements were used to characterize the microstructure and physical and chemical properties of the composite porous carbon nanofibers. The optimal preparation process was identified, and the porous carbon nanofibers were used as the positive sulfur carrier to test its electrochemical performance. The results show that the composite porous carbon nanofibers prepared based on ZnCo2O4 has a large number of channels connected by pores, and the specific surface area is as high as 210.85 m2/g. The assembled lithium-sulfur battery has a typical charge-discharge platform and a significant oxygen reduction peak. An initial discharge specific capacity of 759.2 mA·h/g is achieved, and it still has a reversible specific capacity of 74.0% after 50 charge-discharge cycles. Compared with electrospinning carbon nanofibers without ZnCo2O4 doping, the porous carbon nanofibres has better specific capacity and higher rate performance.

Key words: carbon nanofiber, electrospinning, lithium-sulfur battery, energy storage

CLC Number: 

  • TS102

Fig.1

SEM image (a)and XRD curve(b)of ZCO nanoparticle samples"

Fig.2

SEM images of porous carbon nanofiber with different mass ratios of ZCO and PAN"

Fig.3

SEM images of ZCO/PAN porous carbon nanofibers at different carbonization temperatures"

Fig.4

TEM images of ZCO/PAN porous carbon nanofibers. (a)Channels structure;(b)Particle;(c)Particle (high magnification) "

Fig.5

Raman spectra of porous carbon nanofibers with different ratios of ZCO and PAN"

Fig.6

EDS elemental spectrum of ZCO/PAN porous carbon nanofibers at different carbonization temperatures"

Tab.1

Content of zinc and cobalt in ZCO/PAN porous carbon nanofiber samples at different temperatures"

炭化温度/℃ Co含量/% Zn含量/%
400 2.70 1.30
500 2.83 1.93
600 3.74 2.58
700 8.69 0
800 11.82 0

Fig.7

SEM and surface element distribution images of ZCO/PAN porous carbon nanofibers. (a)SEM image of ZCO/PAN porous carbon nanofibers;(b)C element;(c)O element;(d)Co element"

Fig.8

XPS spectra of ZCO/PAN porous carbon nanofibers. (a)Total spectra; (b) O1s spectra; (c) N1s spectra"

Fig.9

Nitrogen desorption/adsorption isotherm curve(a)and pore size distribution(b)of ZCO/PAN porous carbon nanofibers"

Fig.10

TG curve (a) and XRD pattern (b) of ZCO/PAN/S"

Fig.11

Electrochemical performance of ZCO/PAN/S composite cathode lithium-sulfur battery. (a)Charge-discharge curve;(b)CV curve;(c)Discharge capacity curve;(d)Discharge rate curve"

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