以氧化石墨和氯化亚锡为原料,采用原位合成法制得SnO2/石墨烯纳米复合材料.该方法不需外加还原剂,也避免了SnO2纳米粒子和石墨烯在机械混合过程中的团聚问题.XRD和TEM等的分析结果表明,纳米SnO2颗粒都均匀地分散在石墨烯表面,其中纳米SnO2的粒径和石墨烯的厚度分别为3～6 nm和1.5～2.0 nm.电化学测试结果表明:在200 mA/g电流密度下循环100次后,SnO2/石墨烯负极材料的嵌锂容量可稳定在552 mAh/g,容量保持率比单纯纳米SnO2提高了4.4倍；在40、400、800 mA/g的电流密度下,SnO2/石墨烯负极材料的放电容量可分别保持在724.5、426.0、241.3 mAh/g,表现出较好的倍率性能,该结果归因于石墨烯良好的导电性及其二维纳米结构.
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