Synthesis of copper tin sulfide/reduced graphene oxide composites and their electrochemical properties for lithium ion batteries
Synthesis of copper tin sulfide/reduced graphene oxide composites and their electrochemical properties for lithium ion batteries
复制标题
DOI：
10.1016/j.electacta.2013.09.174
复制
发表时间：
2013-12
影响因子：
6.6
通讯作者：
Zhian Zhang;Chengkun Zhou;Lei Huang;Xiwen Wang;Yaohui Qu;Y. Lai;Jie Li
中科院分区：
文献类型：
--
作者：
Zhian Zhang;Chengkun Zhou;Lei Huang;Xiwen Wang;Yaohui Qu;Y. Lai;Jie Li
采用一锅水热法合成了硫化铋/氧化石墨烯复合材料(Bi2S3/RGO复合材料)。用X射线衍射仪(XRD)、场发射扫描电子显微镜(FESEM)和高分辨电子显微镜(HRTEM)对产物的形貌和晶体结构进行了表征。拉曼光谱和傅里叶变换红外光谱的结果表明，氧化石墨片在一定程度上发生了还原。透射电子显微镜(TEM)观察表明，Bi2S3纳米粒子的长度为80-100 nm，锚定在RGO片上。电化学测试表明，与无GO条件下用类似路线制备的纯Bi2S3相比，Bi2S3/RGO复合材料表现出1073.1 mAhg−1的非凡容量，并且具有优异的循环稳定性和高倍率性能。电化学性能的提高可以归功于RGO薄膜的引入，它不仅缓冲了Li和Bi在合金/非合金反应中的大体积变化，而且为电极在电化学反应过程中的快速电子传输提供了一个高导电网络。
A simple one-pot hydrothermal route was developed to synthesize bismuth sulfide/reduced graphene oxide composites (Bi2S3/RGO composites) in this work. The morphology and crystalline structure of the obtained products were investigated by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high resolution transmission electron microscopy (HRTEM). The results of Raman spectra and Fourier transform infrared (FTIR) spectra demonstrated that graphite oxide (GO) sheets werein situreduced to a certain extent. Transmission electron microscopy (TEM) observation indicated that the Bi2S3nanoparticles, with a size of 80–100 nm in length, are anchored on RGO sheets. Electrochemical tests show the Bi2S3/RGO composite exhibits an extraordinary capacity of 1073.1 mAh g−1with excellent cycling stability and high rate capability compared to pure Bi2S3particles prepared by a similar route in the absence of GO. The enhancement in the electrochemical performance could be attributed to the introduction of RGO sheets that not only buffer the large volume changes during the alloy/dealloy reaction of Li and Bi, but also provide a highly conductive network for rapid electron transport in electrode during electrochemical reaction.