A SnO2/graphene composite as a high stability electrode for lithium ion batteries
A SnO2/graphene composite as a high stability electrode for lithium ion batteries
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DOI：
10.1016/j.carbon.2010.08.052
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发表时间：
2011-01-01
期刊：
影响因子：
10.9
通讯作者：
Liu, Zhaoping
中科院分区：
文献类型：
--
作者：
Wang, Xuyang;Zhou, Xufeng;Liu, Zhaoping
开发了一种简单的基于溶液的合成路线，基于氧化石墨烯和 SnCl2 中心点 2H(2)O 之间的氧化还原反应，生产 SnO2/石墨烯复合材料。在制备的复合材料中，尺寸为 3-5 nm 的结晶 SnO2 纳米粒子均匀地粘附在石墨烯基体上。当用作锂离子电池电极材料时，该复合材料表现出优异的倍率性能和高倍率性能。 循环稳定性 研究了 SnO2/石墨烯配比对电化学性能的影响 结果发现，SnO2/石墨烯的最佳摩尔比约为 3 2 1，相当于石墨烯的 2 4 wt% 该复合材料在 67 mA/g 的电流密度下，经过 30 次充放电循环后，可以提供 840 mAh/g 的充电容量（容量保持率为 86%），并且可以保持约 100% 的充电容量。 在电流密度 400 和 1000 mA/g 下循环 50 次后，分别为 590 和 270 mAh/g (C) 2010 Elsevier Ltd 版权所有
A simple solution based synthesis route, based on an oxidation-reduction reaction between graphene oxide and SnCl2 center dot 2H(2)O, has been developed to produce a SnO2/graphene composite In the prepared composite, crystalline SnO2 nanoparticles with sizes of 3-5 nm uniformly clung to the graphene matrix When used as an electrode material for lithium ion batteries, the composite presented excellent rate performance and high cyclic stability The effect of SnO2/graphene ratio on electrochemical performance has been investigated It was found that the optimum molar ratio of SnO2/graphene was about 3 2 1, corresponding to 2 4 wt % of graphene The composite could deliver a charge capacity of 840 mAh/g (with capacity retention of 86%) after 30 charge/discharge cycles at a current density of 67 mA/g, and it could retain a charge capacity of about 590 and 270 mAh/g after 50 cycles at the current density of 400 and 1000 mA/g, respectively (C) 2010 Elsevier Ltd All rights reserved