准三维MoS2/graphene复合材料储锂性能研究

doi:10.15541/jim20150409

摘要/Abstract

摘要：

本研究以氧化石墨烯为前驱体, 利用钼酸钠和硫脲通过水热法在不同阳离子表面活性剂(C₁₄TAB, C₁₆TAB, C₁₈TAB)的辅助下合成得到MoS₂/GF复合结构。XRD和SEM分析表明, MoS₂/GF复合材料因阳离子表面活性剂的不同而呈现不同的结构和表面形貌; 电化学性能测试表明其结构和表面形貌对电极的容量、循环稳定性和倍率性能都有较大影响。相比于C₁₆TAB和C₁₈TAB, C₁₄TAB辅助合成的MoS₂/GF复合结构具有最高的首次放电容量(955 mAh/g), 50次循环后仍保持751 mAh/g的可逆容量, 而且倍率性能更好。本研究揭示MoS₂/GF复合材料电化学性能的提升可归因于其独特的praticle-on-sheet结构以及MoS₂与石墨烯之间的协同作用。

关键词: 阳离子表面活性剂, MoS2/GF复合结构, 电化学性能, 锂离子电池

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

中图分类号:

TQ174

梁培, 邢淞, 舒海波, 张琳, 胡陈力. 准三维MoS₂/graphene复合材料储锂性能研究[J]. 无机材料学报, 2016, 31(6): 575-580.

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.

图/表 6

图1 800℃热处理2 h后样品的XRD图谱(a)石墨烯薄片; (b) 纯MoS2; (c)MoS2/GF-C14复合材料; (d)MoS2/GF-C16复合材料; (e)MoS2/GF-C18复合材料

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

图2 800℃热处理2 h后样品的SEM照片

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

图3 800℃热处理2 h后MoS2/GF-C14复合材料的TEM(a,b)和HRTEM(c)照片

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

图4 阳离子表面活性剂辅助合成MoS2/GF复合结构的原理图

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

图5 热处理后不同阳离子表面活性剂辅助合成的MoS2/GF复合材料和纯MoS2的前三圈充放电曲线图

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

图6 复合材料电极的前三圈循环伏安性能

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

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准三维MoS₂/graphene复合材料储锂性能研究

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

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