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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (7): 1306-1314    DOI: 10.3785/j.issn.1008-973X.2019.07.009
化学工程     
Bi2S3-MoS2/石墨烯复合材料的合成及电化学储锂性能
朱清(),任王瑜,姜孝男,陈卫祥*()
浙江大学 化学系，浙江 杭州 310027
Synthesis of Bi2S3-MoS2/graphene hybrids and their electrochemical lithium storage performances
Qing ZHU(),Wang-yu REN,Xiao-nan JIANG,Wei-xiang CHEN*()
Department of Chemistry, Zhejiang University, Hangzhou 310027, China
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摘要：

为了研发高性能的锂离子电池负极材料，采用水热法合成了Bi2S3-MoS2/石墨烯复合材料，利用X-射线衍射（XRD）、扫描电镜（SEM）、高分辨透射电镜（HRTEM）、热重分析（TGA）和X-射线光电子能谱（XPS）对复合材料进行表征，讨论复合材料的微观结构对电化学储锂性能的影响. 特别是，当Bi与Mo的物质的量之比为1∶4时，Bi2S3-MoS2/石墨烯的电化学储锂可逆比容量可以达到1 140 mA·h/g，并具有稳定的循环性能. 当充放电电流密度为1 000 mA/g时，其高倍率特性为886 mA·h/g. Bi2S3-MoS2/石墨烯复合材料优异的电化学储锂性能主要由于MoS2具有更少的层数和较多的边缘以及Bi2S3纳米粒子具有更均匀的粒径，并能很好地分散在石墨烯表面，增强了复合材料容纳锂离子的能力，改善了储锂电极过程的动力学性能.
关键词： 二硫化钼;  三硫化二铋;  石墨烯;  锂离子电池    
Abstract:

Bi2S3-MoS2/graphene hybrids was synthesized via a hydrothermal method, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), thermogravimetric analysis (TGA) and X-ray photoelectron spectroscopy (XPS) in order to develop high-performance anode materials for lithium ion battery. The effects of microstructure of hybrids on their electrochemical lithium storage properties were analyzed. Especially, the Bi2S3-MoS2/graphene with Bi to Mo of 1∶4 in molar ratio deliver a reversible specific capacity as high as 1 140 mA·h/g with stable cyclic performance. At the current density of 1 000 mA/g, its high-rate capability is 886 mA·h/g. The excellent electrochemical performance can be contributed to that MoS2nanosheets exhibited few-layer structure with more edges and Bi2S3 nanoparticles displayed more uniform sizes. The nanostructured MoS2 and Bi2S3 were well dispersed on graphene surface. The lithium ion accommodation was enhanced, and the electrode kinetics of lithium storage was improved.
Key words: molybdenum disulfide    bismuthous sulfide    graphene    li-ion battery
收稿日期: 2019-01-08 出版日期: 2019-06-25
CLC:  TM 911  
通讯作者: 陈卫祥     E-mail: 2644017005@qq.com;weixiangchen@zju.edu.cn
作者简介: 朱清（1993—），男，硕士生，从事锂离子电池负极材料的研究. orcid.org/0000-0003-3898-2743. E-mail： 2644017005@qq.com
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引用本文:

朱清,任王瑜,姜孝男,陈卫祥. Bi2S3-MoS2/石墨烯复合材料的合成及电化学储锂性能[J]. 浙江大学学报(工学版), 2019, 53(7): 1306-1314.

Qing ZHU,Wang-yu REN,Xiao-nan JIANG,Wei-xiang CHEN. Synthesis of Bi2S3-MoS2/graphene hybrids and their electrochemical lithium storage performances. Journal of ZheJiang University (Engineering Science), 2019, 53(7): 1306-1314.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.07.009    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I7/1306

图 1  不同样品的X-射线衍射图
图 2  不同样品的扫描电镜图
图 3  样品在不同放大倍率下的TEM图以及Bi2S3-MoS2/G-2的元素分布图
图 4  Bi2S3-MoS2/G-2复合材料的XPS图
图 5  不同样品的热重曲线
图 6  不同电极前3圈的循环伏安图（扫描速度为0.5 mV/s）
图 7  不同电极的前3圈充/放电曲线（电流密度为100 mA/g）
图 8  不同电极的循环和倍率性能图以及Bi2S3-MoS2/G-2电极在1 000 mA/g下的循环性能
图 9  不同电极的电化学阻抗谱和相应的等效电路，CPE为恒相位元
电极 Re/Ω Rf/Ω Rct/Ω
MoS2/G 9.57 16.66 28.26
Bi2S3-MoS2/G-1 8.35 16.54 24.21
Bi2S3-MoS2/G-2 8.21 11.87 12.73
Bi2S3-MoS2/G-3 8.55 13.78 27.57
Bi2S3/G 8.84 29.71 79.67
表 1  电化学阻抗拟合得到的动力学参数
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