Journal of Jilin University(Engineering and Technology Edition) ›› 2023, Vol. 53 ›› Issue (2): 376-384.doi: 10.13229/j.cnki.jdxbgxb20210704

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N⁃doped Co/Co3O4@C core⁃shell nanoparticles as anode materials for lithium⁃ion batteries

Su-feng WEI1(),Xin PING2,Chun-lin LI2,Guo-yong WANG2()   

  1. 1.College of Materials Science and Engineering，Changchun University of Technology，Changchun 130012，China
    2.College of Materials Science and Engineering，Jilin University，Changchun 130022，China
  • Received:2021-07-26 Online:2023-02-01 Published:2023-02-28
  • Contact: Guo-yong WANG E-mail:weisufeng@gmail.com;materwanggy@jlu.edu.cn

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Abstract:

When high-capacity transition metal oxides want to replace current low-capacity commercial carbon as anode materials for lithium-ion batteries， they must be designed to solve the pulverization and conductivity issues. In this paper，N-doped carbon-based Co/Co3O4@C core-shell structure composites by pyrolysis and hydrothermal oxidation were innovatively synthesized by us. By adjusting the hydrothermal time， complete structure， regular morphology and uniform size product can be achieved. The core-shell structure composed of nitrogen-doped carbon can shorten the transmission path of lithium-ion， which leads to the high conductivity of these composites. In addition， there are more pores in the amorphous carbon， which can not only make full contact with the electrolyte during charging and discharging， but also reduce the volume expansion generated in the cycling process and delay the rate of capacity decay caused by the structural collapse. The results of the electrochemical show that the discharge capacity was stable at 620 mA·h/g （carbon content 56.8 wt%） after 50 cycles of constant current of 0.1 A/g， which is higher than its theoretical specific capacity. After 250 cycles， the reversible capacity can reach 572 mA·h/g and the coulomb efficiency can be maintained at about 99.8% under the constant current of 2A/g. The results show that the N-doped carbon-based Co/Co3O4 nanoparticle core-shell structure composites with good dispersion can improve the conductivity and electrochemical performance of the electrode of the high capacity of lithium ion batteries with a long cycle life.

Key words: metal-organic frameworks, core-shell structure, lithium-ion batteries, anode materials

CLC Number: 

  • TB332

Fig.1

XRD patterns and FESEM images"

Fig.2

XPS spectra of Co/Co3O4 @ C-8h composites"

Fig.3

Co/Co3O4@C-8h compsites TEM image， HRTEM image， EDS image"

Fig.4

Co/ Co3O4@C-8h composites"

Fig.5

Nyquist curves of synthesized Co/Co3O4@C and pure Co3O4 （frequency range from 100 kHz to 0.01 Hz）"

Table 1

Electrochemical properties of Co3O4 and Co3O4-based composite electrodes previously reported for LIBs"

样 本电流密度/ （mA·g-1）容量/ （mA·h·g-1）
Co3O4 nanoparticles1000462

MOF-derived Co3O4

microspheres

1000392
Co3O4-CuO nanomatrix1000497.78
CoO@Co3O4@C500158±5
Co3O4/RGO100077.7
Co3O4@N-CNFs800267
NCF/Co3O41000340

N-doped

Co/Co3O4@C（本文）

1000498
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