VS2 Nanosheets: A Potential Anode Materiral for Li-ion Batteriers

doi:10.15541/jim20150345

Abstract

Abstract:

The flower-like VS₂ nanosheets were synthesized by a one-step solvothermal method. The X-ray diffraction, Raman, SEM, and TEM studies showed the growth mechanism of VS₂ flowers in detail. These experimental results indicate that the reaction temperature and time have the direct effect on the formation of VS₂ nanosheets. As anode material for Li-ion batteries, the VS₂ nanosheets exhibit an initial discharge and charge capacity are 195.4 and 90.6 mAh/g at current density of 200 mA/g. High Coulombic efficiency over 98% and improved rate capacity are achieved for the VS₂ nanosheets. All results suggest that the VS₂ nanosheets can be utilized as a promising anode material for Li-ion batteries with high power density and fast charge/discharge rates.

Key words: VS2, nanosheets, Li- ions batteries, anode materials

CLC Number:

TQ174

LIU Jian-Zhe, GUO Peng-Fei. VS₂ Nanosheets: A Potential Anode Materiral for Li-ion Batteriers[J]. Journal of Inorganic Materials, 2015, 30(12): 1339-1344.

Figures/Tables 6

Fig. 1 Powder X-ray diffraction patterns of samples (a) and Raman spectrum of sample S4 (b)

Fig. 2 SEM and FESEM images of samples prepared at 180℃ for 10 h (a, b), 15 h (c, d) and 20 h (e, f)

Fig. 3 TEM image of ultrathin (a), HRTEM image (b), SE-AD pattern (c), and the unit cell and side view of VS2 nanosheets (d) thicknesses is about 500 nm.

Fig. 4 SEM images of samples prepared at 140℃ (a, b) and 160℃ (c, d)

Fig. 5 Discharge and charge curves at a current density of 200 mA/g cycled between the voltage of 3.0-0.01 V vs Li/Li+ (a), cycling performance of the prepared VS2 nanosheets electrode at 200 mA/g (b), and rate capability of the VS2 nanosheets electrode between 50 mA/g and 800 mA/g (c)

Table 1 Comparison of electrochemical performance data for various LIB electrode materials of base VS2 and its hybrids

Sample	Voltage vs (Li/Li⁺)/V	Theoretical specific capacity/ (mAh·g^-1)	First discharge capacity/ (mAh·g^-1)	Coulombic efficiency after (x) cycles/%	References
VS₂	2.43	466	86.0	-	[12]
PEDOT/ VS₂	2.68	-	130.0	-	[12]
PEDOT	2.80	-	78.0	-	[12]
VS₂nanosheets	2.10	466	195.4	98(200)	This work

References 22

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VS₂ Nanosheets: A Potential Anode Materiral for Li-ion Batteriers

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