MoO2/C Co-coated Si/graphite Composite as Anode Materials for Lithium Ion Batteries†

doi:10.7503/cjcu20150241

Abstract

Abstract:

A sol-gel method was used to fabricate MoO₂ and C co-coated Si/graphite particles to form Si/graphite/MoO₂/carbon(SGMC) composite as anode materials for lithium ion batteries. X-ray diffraction(XRD), scanning electron microscopy(SEM), transmission electron microscopy(TEM), cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) were utilized to characterize the morphology and properties of the composite. The MoO₂/C double coating has inhibited the volume expansion, improved the electronic conductivity and lithium ion mobility, and further improved the electrochemical performances. Electrochemical tests showed that the first charge capacities of SGMC composite was 2494 mA·h/g with an initial coulombic efficiency of 72%. The charge capacity maintained 636.6 mA·h/g over 100 cycles.

Key words: MoO2/C co-coated Si/graphite, Lithium ion battery, Sol-gel method, Anode material

CLC Number:

O646

TrendMD:

YIN Hong, ZHOU Dan, CONG Lina, XIE Haiming, QIU Yongqing. MoO₂/C Co-coated Si/graphite Composite as Anode Materials for Lithium Ion Batteries^†[J]. Chem. J. Chinese Universities, 2015, 36(10): 1990.

Figures/Tables 6

Fig.1 XRD patterns of Si/graphite(a) and SGMC composite(b)

Fig.2 SEM images of Si/graphite(A) and SEM(B), TEM(C) and HRTEM(D) images of SGMC composite

Fig.3 Charge(a—c)/discharge(a'—c') curves of Si/graphite(A) and SGMC composites(B) during the first three cyclesa, a'. The first cycle; b, b'. the second cycle; c, c'. the third cycle.

Fig.4 Cycle performance of Si/graphite and SGMC composites at a current density of 100 mA/g

Fig.5 Cyclic voltammery curves of Si/graphite(A) and SGMC(B) composites at a scan rate of 0.1 mV/s

Fig.6 Electrochemical impedance spectroscopy for the Si/graphite(a) and SGMC(b) composites

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MoO₂/C Co-coated Si/graphite Composite as Anode Materials for Lithium Ion Batteries^†

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