Hu Xuebo, Ma Minhao, Zeng Mengqi, Sun Yangyong, Chen Linfeng, Xue Yinghui, Zhang Tao, Ai Xinping, Mendes Rafael G, Rümmeli Mark H, Fu Lei
College of Chemistry and Molecular Science, Wuhan University , Wuhan 430072, People's Republic of China.
ACS Appl Mater Interfaces. 2014 Dec 24;6(24):22527-33. doi: 10.1021/am5066255. Epub 2014 Dec 9.
Magnetite (Fe3O4) is an attractive electrode material due to its high theoretical capacity, eco-friendliness, and natural abundance. However, its commercial application in lithium-ion batteries is still hindered by its poor cycling stability and low rate capacity resulting from large volume expansion and low conductivity. We present a new approach which makes use of supercritical carbon dioxide to efficiently anchor Fe3O4 nanoparticles (NPs) on graphene foam (GF), which was obtained by chemical vapor deposition in a single step. Without the use of any surfactants, we obtain moderately spaced Fe3O4 NPs arrays on the surface of GF. The particle size of the Fe3O4 NPs exhibits a narrow distribution (11 ± 4 nm in diameter). As a result, the composites deliver a high capacity of about 1200 mAh g(-1) up to 500 cycles at 1 C (924 mAh g(-1)) and about 300 mAh g(-1) at 20 C, which reaches a record high using Fe3O4 as anode material for lithium-ion batteries.
磁铁矿（Fe3O4）因其高理论容量、环境友好性和天然丰度而成为一种有吸引力的电极材料。然而，由于其在锂离子电池中的商业应用受到大体积膨胀和低电导率导致的循环稳定性差和倍率性能低的阻碍。我们提出了一种新方法，利用超临界二氧化碳将Fe3O4纳米颗粒（NPs）有效地锚定在通过一步化学气相沉积获得的石墨烯泡沫（GF）上。在不使用任何表面活性剂的情况下，我们在GF表面获得了间距适中的Fe3O4 NPs阵列。Fe3O4 NPs的粒径呈现出窄分布（直径为11±4 nm）。结果，该复合材料在1 C（924 mAh g(-1)）下循环500次时可提供约1200 mAh g(-1)的高容量，在20 C下约为300 mAh g(-1)，这是使用Fe3O4作为锂离子电池负极材料的创纪录高值。
