CTAB-assisted Synthesis of MoS2/C Nano-flowers with Improved Electrochemical Performances for Lithium Ion Batteries

doi:10.15541/jim20160042

Abstract

Abstract:

MoS₂/C composites were prepared by a simple CTAB assistant thermal reduction method using sodium molybdate, thiourea and CTAB as starting materials. The samples were characterized by XRD, SEM, TEM, and TG. It is confirmed that the amorphous carbon is partially inserted into the interlayer spaces of molybdenum disulfide and inhibits the accumulation of (002) plane. Meanwhile, the electrochemical properties were studied in detail. As a consequence, the MoS₂/C composites have better electrochemical performance than pure MoS₂. The composite synthesized by adding 0.025 g CTAB shows the best electrochemical performance. The initial discharge capacity was 730 mAh/g and a stable capacity above 415 mAh/g was retained for 100 cycles tested at 100 mA/g. At last, the possible growth mechanism of the MoS₂/a-C composites and the influence of different micro-morphology are also calculated.

Key words: MoS2/C composites, lithium ion batteries, anode materials

CLC Number:

TQ174

CAI Ya-Ling, LI Ya-Fei, WANG Zeng-Mei, ZHANG Yao, CHEN Jian, GUO Xin-Li. CTAB-assisted Synthesis of MoS₂/C Nano-flowers with Improved Electrochemical Performances for Lithium Ion Batteries[J]. Journal of Inorganic Materials, 2016, 31(12): 1289-1294.

Figures/Tables 8

Fig. 1 XRD patterns of samples

Fig. 2 TGA curves of samples

Table 1 MoS2 and carbon content of samples

Sample	MoO₃/%	MoS₂/%	C/%
MoS₂/C-NF-0.025	78.9	87.6	12.4
MoS₂/C-NF-0.05	77.4	85.9	14.1
MoS₂/C-NF-0.1	74.8	83.0	17.0
MoS₂/C-NF-0.2	71.4	79.2	20.8
MoS₂/C-NF-0.3	68.8	76.3	23.7

Fig. 3 SEM images of samples^(a) MoS2/C-NF-0.025; (b) MoS2/C-NF-0.05; (c) MoS2/C-NF-0.1; (d) MoS2/C-NF-0.2; (e) MoS2/C-NF-0.3; (f) MoS2

Fig. 4 TEM images of samples^(a) MoS2/C-NF-0.025; (b) MoS2/C-NF-0.05; (c) MoS2/C-NF-0.1; (d) MoS2/C-NF-0.2; (e) MoS2/C-NF-0.3; (f) MoS2

Fig. 5 Schematic illustration of the growth mechanisms of MoS2/C sample

Fig. 6 The initial three charge/discharge potential profiles of samples^(a) MoS2/C-NF-0.025; (b) MoS2/C-NF-0.05; (c) MoS2/C-NF-0.1; (d) MoS2/C-NF-0.2; (e) MoS2/C-NF-0.3

Fig. 7 Cyclic performance of samples

References 14

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CTAB-assisted Synthesis of MoS₂/C Nano-flowers with Improved Electrochemical Performances for Lithium Ion Batteries

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