Graphene‐Supported Ce–SnS2 Nanocomposite as Anode Material for Lithium‐Ion Batteries
Graphene‐Supported Ce–SnS2 Nanocomposite as Anode Material for Lithium‐Ion Batteries
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DOI：
10.1111/jace.12302
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发表时间：
2013-07
影响因子：
3.9
通讯作者：
Qiufen Wang;Ying Huang;J. Miao;Yang Zhao;Wei Zhang;Y. Wang
中科院分区：
文献类型：
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作者：
Qiufen Wang;Ying Huang;J. Miao;Yang Zhao;Wei Zhang;Y. Wang
采用水热法合成了石墨烯负载Ce-SnS_2(Ce-SnS_2/石墨烯)纳米复合材料。通过X射线衍射仪、扫描电子显微镜、透射电子显微镜、拉曼光谱、X射线光电子能谱、热重分析和电化学测试等手段对复合材料的结构、形貌和电化学性能进行了研究。Ce-SnS_2颗粒呈花状分布在石墨烯薄膜(GN)上。每片花瓣的颗粒大小在50-100 nm之间，晶格条纹清晰。样品中锡、S、Ce、C、O的原子比为1：2：0.05：3.11：0.64，Ce-SnS_2复合材料的含量为80wt.%。由于Ce-SnS_2纳米粒子与石墨烯纳米片之间的协同作用，Ce-SnS_2/石墨烯复合材料表现出高的首次放电容量(0.5C时为1638.3 mAh/g)、高容量(50次循环后0.5℃时的容量保持率为707mAh/g)以及良好的倍率性能。优异的性能归功于石墨烯的存在，保持了结构的稳定。
A graphene-supported Ce–SnS2 (Ce–SnS2/graphene) nanocomposite has been synthesized via a hydrothermal route. Structure, morphology, and electrochemical properties of the composites were studied by means of XRD, SEM, TEM, Raman, XPS, TGA, and electrochemical measurements. The Ce–SnS2 crystal particles with a flower-like structure were distributed on the graphene sheets (GNS). The particle sizes of each petal are in the range 50–100 nm with clear lattice fringes. The atomic ratio of Sn, S, Ce, C, and O is estimated to be 1:2:0.05:3.11:0.64 and the content of Ce–SnS2 composite is 80 wt.% in the as-synthesized sample. The Ce–SnS2/graphene composite exhibits high initial discharge capacity (1638.3 mAh/g at 0.5 C), high capacity retention (707 mAh/g at 0.5 C after 50 cycles), and good rate capability due to the synergy effect between Ce–SnS2 nanoparticles and graphene nanosheets. The superior performance is ascribed to the presence of graphene keeping the structure stable.