石墨烯-二硫化钼复合负极材料的制备及性能研究

doi:10.15541/jim20150432

无机材料学报 ›› 2016, Vol. 31 ›› Issue (4): 345-350.DOI: 10.15541/jim20150432

石墨烯-二硫化钼复合负极材料的制备及性能研究

刘战强, 唐宇峰, 林天全, 毕辉, 于刘涛, 黄富强

(中国科学院上海硅酸盐研究所, 上海200050)

收稿日期:2015-09-11 修回日期:2015-10-17 出版日期:2016-04-20 网络出版日期:2016-03-25
作者简介:刘战强(1976–), 男, 博士, 高级工程师. E-mail: liuzq@mail.sic.ac.cn
基金资助:
国家自然科学基金重点项目(91122034;21203234)

Preparation and Characterization of Graphene-MoS₂ Composite Anode Materials

LIU Zhan-Qiang, TANG Yu-Feng, LIN Tian-Quan, BI Hui, YU Liu-Tao, HUANG Fu-Qiang

(Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China)

Received:2015-09-11 Revised:2015-10-17 Published:2016-04-20 Online:2016-03-25
About author:LIU Zhan-Qiang. E-mail: liuzq@mail.sic.ac.cn
Supported by:
National Natural Science Foundation of China (91122034;21203234)

摘要/Abstract

摘要：

借助机械球磨法, 成功地利用层状硫化物MoS₂对膨胀石墨实现了有效剥离, 得到石墨烯与MoS₂的复合材料。球磨处理后, 元素C均匀地分散在复合材料中。MoS₂ 与膨胀石墨的质量比越高, 得到的复合材料中具有石墨烯特征的石墨就越多, 但相应的石墨烯的缺陷也越多。优化后的复合材料用作锂离子电池负极材料时显示出良好的电池性能, 在小倍率0.1 Ah/g电流密度下充放电循环70次后, 电池容量仍保持在~ 570 mAh/g; 在大倍率1 A/g电流密度下充放电循环55次后, 电池容量仍能保持在~ 450 mAh/g。

关键词: MoS2, 石墨烯, 负极材料, 机械球磨

Abstract:

To meet the high performances of lithium ion batteries, it is very important to develop novel anode materials with high electrochemical capacity to replace the current carbon based materials. Molybdenum disulfide is widely known as a potential anode material and graphene is an effective additive for achieving the electrochemical properties of MoS₂. In this study, with the aid of mechanical milling, edge-opened graphite was designed to be exfoliated into graphene by layered MoS₂ to form composite anode materials, Gr/MoS₂. This method was applicable to prepare Gr-MoS₂composites in large scale. The composite anode samples were characterized by XRD, SEM, EDS, HRTEM, Raman spectra, electrochemical testing. The results showed that the graphite with large size disappeared and element carbon was uniformly distributed in the ball-milling treated composite. With increase of the mass ratio of MoS₂ to edge-opened graphite, the content of graphene in the obtained composite increased, but with more defects existed in the structure. The optimized Gr-MoS₂ composites displayed good charge/discharge character and the capacity still maintained at 450 mAh/g after 55 charge/discharge cycles at a current density of 1 A/g.

Key words: MoS2, graphene, anode material, mechanical milling

中图分类号:

TQ174

刘战强, 唐宇峰, 林天全, 毕辉, 于刘涛, 黄富强. 石墨烯-二硫化钼复合负极材料的制备及性能研究[J]. 无机材料学报, 2016, 31(4): 345-350.

LIU Zhan-Qiang, TANG Yu-Feng, LIN Tian-Quan, BI Hui, YU Liu-Tao, HUANG Fu-Qiang. Preparation and Characterization of Graphene-MoS₂ Composite Anode Materials[J]. Journal of Inorganic Materials, 2016, 31(4): 345-350.

图/表 10

图1 样品A、B及C的XRD图谱

Fig. 1 XRD patterns of sample A, B and C

图2 样品A、B及C的扫描电镜微观形貌照片

Fig. 2 SEM images of the sample A, B and C (a, b) Sample A; (c) Sample B; (d) Sample C

图3 样品A的透射电镜微观形貌照片

Fig. 3 TEM images of the sample A at different magnifications

图4 样品A中的元素C分布图

Fig. 4 Elemental mapping for carbon in sample A

图5 样品A、B及C的Raman光谱

Fig. 5 Raman spectra of sample A, B and C

图6 样品A电池在电流密度为0.1 A/g下充放电曲线,

Fig. 6 Discharge-charge profiles of sample A at current density of 0.1 A/g

图 7 样品A、B及C电池的前三次循环伏安曲线

Fig. 7 Initial three CV curves of sample A, B and C

图8 样品A、B及C电池的倍率性能测试

Fig. 8 Rate capability of sample A, B and C

图9 (a)样品A、B及C电池在1 A/g电流密度下充放电性能和(b)样品A在0.1 A/g电流密度下充放电性能

Fig. 9 Cycle performance of (a) sample A, B and C at a constant current density of 1 A/g and (b) samples A at a constant current density of 0.1 A/g

图 10 样品A、B及C电池在充放电前后的交流阻抗谱

Fig. 10 Complex impedance spectra of sample A, B and C before (a) and after (b) discharge-charge cycles

参考文献 13

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石墨烯-二硫化钼复合负极材料的制备及性能研究

Preparation and Characterization of Graphene-MoS₂ Composite Anode Materials

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石墨烯-二硫化钼复合负极材料的制备及性能研究

Preparation and Characterization of Graphene-MoS2 Composite Anode Materials

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Preparation and Characterization of Graphene-MoS₂ Composite Anode Materials