Preparation of CoO Nanoparticles/Hollow Graphene Nanofiber Composites and Its Electrochemical Performances

doi:10.7503/cjcu20220462

Abstract

Abstract:

Using the graphenes and Co（CH₃COO）₂·4H₂O as raw materials， the CoO nanoparticles/hollow graphene nanofiber composites were synthesized by the ultrasound-assisted method as the anode materials for lithium-ion batteries. X-ray diffraction（XRD） was used to determine the phase compositions of the materials， scanning electron microscope（SEM） and transmitting electron microscope（TEM） were used to observe the surface morphologies and microstructures of the materials， and X-ray photoelectron spectroscopy（XPS） was used to determine the valence structures of the materials. Cyclic voltammetry， galvanostatic charge and discharge， and AC impedance spectroscopy tests were performed on the materials to characterize its electrochemical performances. The electrochemical performances of the composite materials showed that the reversible capacity still exceeded 800 mA/g and the coulombic efficiency was above 99% at a current density of 100 mA/g after 160 cycles. The excellent electrochemical performances were attributed to the hollow fiber structures of graphenes. The prepared materials exhibited two very excellent characteristics： one was that the hollow interior could contain electrolytes， which would directly transport ions to the particle surfaces， realizing rapid ion transmission； second， the two-dimensional hollow fibers were built into a three-dimensional network structures to realize a three-dimensional electronic conduction network.

Key words: Hollow graphene nanofibers, Anode material, Lithium ion battery, Electrochemical performance

CLC Number:

O646

TrendMD:

HU Shiying, SHEN Jiayan, HAN Junshan, HAO Tingting, LI Xing. Preparation of CoO Nanoparticles/Hollow Graphene Nanofiber Composites and Its Electrochemical Performances[J]. Chem. J. Chinese Universities, 2023, 44(2): 20220462.

Figures/Tables 10

References 36

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Species	Peak KE/eV	FWHM/eV	Area（P） CPS/eV	Atomic fraction（%）
C₁_s	1202.23	1.54	248695.71	75.33
O₁_s	955.50	4.42	141041.22	17.67
Co₂_p	706.12	4.79	282598.07	7.00

Species	Peak KE/eV	FWHM/eV	Area（P） CPS/eV	Atomic fraction（%）
C₁_s	1202.23	1.54	248695.71	75.33
O₁_s	955.50	4.42	141041.22	17.67
Co₂_p	706.12	4.79	282598.07	7.00

Species	Current density/（mA·g^‒1）	Initial Columbic efficiency（%）	Cycle number	Capacity/（mA·h·g^‒1）	Ref.
CoO/HGOF	100	72	160	800	This work
CoO/GNS	500	71.2	104	626.3	［34］
CoO	60	—	40	475	［35］
rGO	100	69	100	325	［36］

Species	Current density/（mA·g^‒1）	Initial Columbic efficiency（%）	Cycle number	Capacity/（mA·h·g^‒1）	Ref.
CoO/HGOF	100	72	160	800	This work
CoO/GNS	500	71.2	104	626.3	［34］
CoO	60	—	40	475	［35］
rGO	100	69	100	325	［36］

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