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石墨烯/铁酸镍/二氧化锡复合物的制备及其锂电性能
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摘要
本文采用水热法制备出石墨烯/铁酸镍/二氧化锡(GO/NiFe_2O_4/SnO_2)复合材料。利用X射线衍射仪(XRD)表征了材料的组成,利用透射电子显微镜表征了材料的形貌,最后研究了复合物材料作为锂离子电池负极材料的电化学性能。结果表明水热法可以方便地制备出GO/NiFe_2O_4/SnO_2纳米材料,复合物材料粒径在20-30纳米左右,均匀的负载在石墨烯上。在0.2A/g的电流密度下,材料首次放电比容量1353mAh/g,经过40圈循环测试后比容量的保持率为79.5%,展现出良好的循环稳定性。复合物材料加入了石墨烯后,减小了材料的电阻,有效提高了材料的循环稳定性。同时,二氧化锡的加入,使材料的电化学性能再次得到提升,增加了复合物的导电性,从而使其表现出优异的锂离子电化学性能。
A simple hydrothermal method for the synthesis of graphene/ NiFe_2O_4 /SnO_2(GO/NiFe_2O_4/SnO_2)composite is reported in this study.The characteristics of material are examined by X-ray diffraction(XRD) and transmission electron microscopy(TEM).The performance of GO/NiFe_2O_4/SnO_2 as anode material was tested in Li-ion battery.The result shows that nano GO/NiFe_2O_4/SnO_2 can be synthesized by the hydrothermal method in a convenient way.The size of square composite particle is 20-30 nm.The composite are loaded on the surface of GO.The GO/NiFe_2O_4/SnO_2 shows the lithiation capacity of 1353mAh/g~(-1) in first cycle,while the retention capacitance can reach to 79.5%after 40 cycles,showing good stability cycle performance.The resistance of the material becomes less because of the existence of GO,which remarkably improve the cyclic stability.In the meantime,the electrochemical performance and conductivity of composite are great enhanced due to the accession of SnO_2,With these advantage,the as-prepared composit exhibits excellent electrochemical behavior of the Li-ion batteries.
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