Analogous Three-dimensional MoS2/Graphene Composites for Reversible Li Storage

doi:10.15541/jim20150409

Abstract

Abstract:

MoS₂/GF composites were synthesized by hydrothermal method using graphene oxide (GO), sodium molybdate and thiourea as raw materials with assistance of different cationic surfactants (C₁₄TAB, C₁₆TAB, C₁₈TAB). The investigation of as-prepared samples by X-ray diffraction and scanning electron microscopy demonstrate that the composites have presented different morphologies and microstructures which may be resulted from the cationic surfactants. Electrochemical performances for reversible Li⁺ storage of the composites reveal that the capacities, cycling stability and rate capability are influenced by different morphologies and microstructures. Comparison to C₁₆TAB and C₁₈TAB assistance, the composite synthesized with C₁₄TAB assistance delivers a high first discharge capacity of 955 mAh/g and reversible capacity of 751 mAh/g after 50 cycles, shoowing excellent rate capability. The improvement in the electrochemical performances of the composites synthesized with C₁₄TAB assistance is attributed to its special particle-on-sheet structure and synergistic interactions between graphene and MoS₂.

Key words: cationic surfactants, MoS2/GF composites, electrochemical performances, lithium ion battery

CLC Number:

TQ174

LIANG Pei, XING Song, SHU Hai-Bo, ZHANG Lin, HU Chen-Li. Analogous Three-dimensional MoS₂/Graphene Composites for Reversible Li Storage[J]. Journal of Inorganic Materials, 2016, 31(6): 575-580.

Figures/Tables 6

Fig. 1 XRD patterns of GF (a), bare MoS2 (b), MoS2/GF-C14 (c), MoS2/GF-C16 (d), and MoS2/GF-C18 (e) composites after heat-treatment at800℃ for 2 h

Fig. 2 SEM images of GF(a), bare MoS2 (b), MoS2/GF-C14 (c), MoS2/GF-C16 (d), and MoS2/GF-C18 (e) composites after heat treatment at 800℃ for 2 h

Fig. 3 TEM(a,b) and HRTEM (c) images of MoS2/GF-C14 composites after heat-treatment at 800℃ for 2 h

Fig. 4 Schematic diagram for the synthesis of MoS2/GF composites assisted by different cationic surfactants

Fig. 5 The initial three charge/discharge potential profiles of (a) MoS2/GF-C14, (b) MoS2/GF-C16, (c) MoS2/GF-C18 composites, and (d) bare MoS2 after heat treatment

Fig. 6 Cyclic voltammograms of composite electrodes in the first three cycles. (a) MoS2/GF-C14; (b) MoS2/GF-C14, MoS2/GF-C16, MoS2/GF-C18, and bare MoS2; (c) Rate capability

References 23

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Analogous Three-dimensional MoS₂/Graphene Composites for Reversible Li Storage

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