Synthesis of carbon coated Fe3O4/SnO2 composite beads and their application as anodes for lithium ion batteries
Synthesis of carbon coated Fe3O4/SnO2 composite beads and their application as anodes for lithium ion batteries
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DOI：
10.1179/1753555713y.0000000072
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发表时间：
2013-09-01
影响因子：
3.1
通讯作者：
Xue, J. M.
中科院分区：
文献类型：
--
作者：
Chen, Y.;Song, B. H.;Xue, J. M.
两种金属氧化物材料，即Fe3O4和SnO2，结合成一个专门设计的纳米结构，用于锂离子电池的应用。首先通过一步溶剂热法合成了平均尺寸约为700 nm的空心多孔Fe3O4微珠，然后通过水热法修饰SnO2纳米颗粒。涂层薄碳层进一步提高了整体电化学性能。在100 mA g（-1）的电流密度下，该复合珠的第一次可逆容量达到834.7 mA h g（-1）。在500ma g（-1）的高电流密度下进行测试时，碳涂层Fe3O4/SnO2在第200次循环时具有569.5 mA h g（-1）的稳定可逆容量。金属氧化物具有较高的理论容量、理想的纳米级形貌、碳涂层以及Fe3O4和SnO2之间的协同效应是其优异性能的主要原因。
Two metal oxide materials, namely, Fe3O4 and SnO2, were combined into one specially designed nanostructure for lithium ion battery application. Hollow and porous Fe3O4 beads with an average size of similar to 700 nm were first synthesised through a one-step solvothermal route, followed by the decoration of SnO2 nanoparticles via a hydrothermal method. A thin carbon layer was coated to further enhance the overall electrochemical performances. Under the current density of 100 mA g(-1), the first reversible capacity of such composite beads reached 834.7 mA h g(-1). While being tested at a higher current density of 500 mA g(-1), carbon coated Fe3O4/SnO2 delivered steady reversible capacities with 569.5 mA h g(-1) at two hundredth cycle. Such performances were attributed to the high theoretical capacities of the metal oxides, desired morphology in nanoscale, carbon coating layer and the synergistic effect between Fe3O4 and SnO2.