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
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DOI：
10.1016/j.electacta.2014.07.159
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发表时间：
2014-10-10
影响因子：
6.6
通讯作者：
Lai, Yanqing
中科院分区：
文献类型：
--
作者：
Zhang, Zhian;Zhou, Chengkun;Lai, Yanqing
以乙二胺四乙酸二钠(EDTA-Na-2)为络合剂，采用一锅水热法制备了铜锡硫化物/氧化石墨烯(CTS/RGO)复合材料。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原位还原。扫描电子显微镜和透射电子显微镜观察表明，CTS微球的平均直径为450 nm左右，锚定在RGO片材上。电化学测试表明，与相同路线制备的Cu2SnS3中空微球(CTS-HMSS)相比，CTS/RGO复合材料具有1514.6 mAHg(-1)的超高容量，具有更高的初始库仑效率、优异的循环稳定性和更好的倍率性能。电化学性能的提高可以归功于RGO薄膜的引入，它不仅适应了电极材料的体积变化，从而带来了电极材料的结构完整性，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。(C)2014爱思唯尔有限公司。保留所有权利。
Copper tin sulfide/reduced graphene oxide (CTS/RGO) composites are facile synthesized via a simple one-pot hydrothermal route using ethylenediamine tetraacetic acid disodium salt (EDTA-Na-2) as a chelating agent. The results of Raman spectra and Fourier transform infrared (FTIR) spectra demonstrate that graphite oxide (GO) sheets are in situ reduced to a certain extent. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observations indicate that CTS microspheres, with an average diameter of 450 nm around, are anchored on RGO sheets. Electrochemical tests show the CTS/RGO composites exhibit an extraordinary capacity of 1514.6 mAh g(-1) with a higher initial coulombic efficiency, excellent cycling stability and better rate capability compared to Cu2SnS3 hollow microspheres (CTS-HMSs) prepared by a similar route in the absence of GO. The enhancement in the electrochemical performance can be attributed to the introduction of RGO sheets that not only accommodate the volume changes and therefore bring the structural integrity of electrode materials, but also provide a highly conductive network for rapid electron transport in electrode during electrochemical reaction. (C) 2014 Elsevier Ltd. All rights reserved.