Bi2S3-MoS2/graphene hybrids was synthesized via a hydrothermal method, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) in order to develop high-performance anode materials for lithium ion battery. The effects of microstructure of hybrids on their electrochemical lithium storage properties were analyzed. Especially, the Bi2S3-MoS2/graphene with Bi to Mo of 1∶4 in molar ratio deliver a reversible specific capacity as high as 1 140 mA·h/g with stable cyclic performance. At the current density of 1 000 mA/g, its high-rate capability is 886 mA·h/g. The excellent electrochemical performance can be contributed to that MoS2nanosheets exhibited few-layer structure with more edges and Bi2S3 nanoparticles displayed more uniform sizes. The nanostructured MoS2 and Bi2S3 were well dispersed on graphene surface. The lithium ion accommodation was enhanced, and the electrode kinetics of lithium storage was improved.
Qing ZHU,Wang-yu REN,Xiao-nan JIANG,Wei-xiang CHEN. Synthesis of Bi2S3-MoS2/graphene hybrids and their electrochemical lithium storage performances. Journal of ZheJiang University (Engineering Science), 2019, 53(7): 1306-1314.
Fig.1X-ray diffraction patterns of different samples
Fig.2Scanning electron microscope images of different samples
Fig.3TEM images of samples at different magnification and elemental mapping of Bi2S3-MoS2/G-2
Fig.4XPS of Bi2S3-MoS2/G-2 hybrid material
Fig.5TG curves of different samples
Fig.6Cyclic voltammograms for first three cycles of different electrodes at scan rate with 0.5 mV/s
Fig.7Charge and discharge curves for first three cycles of different electrodes at 100 mA/g
Fig.8Cycling performances and rate capabilities for different electrodes and cycling performance of Bi2S3-MoS2/G-2 at 1 000 mA/g
Fig.9Electrochemical impedance spectroscopy (EIS) of different electrodes and its equivalent circuit model, in which CPE is constant phase element
电极
Re/Ω
Rf/Ω
Rct/Ω
MoS2/G
9.57
16.66
28.26
Bi2S3-MoS2/G-1
8.35
16.54
24.21
Bi2S3-MoS2/G-2
8.21
11.87
12.73
Bi2S3-MoS2/G-3
8.55
13.78
27.57
Bi2S3/G
8.84
29.71
79.67
Tab.1Kinetic parameters obtained by fitting EIS response
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