水热合成Fe_3O_4纳米晶及其作为负极材料研究

Hydrothermal synthesis of Fe_3O_4 nanocrystal as anode material

在当前能源紧缺、环境污染的双重压力之下,探索新的能源材料显得尤为重要。通过以FeSO4·（NH4）2SO4·6H2O为铁源,油酸为表面活性剂,NaOH、乙醇为溶剂,在水热条件下于180℃反应10h,得到Fe3O4纳米晶。通过对该材料进行X-射线衍射（XRD）、透射电镜（TEM）测试发现其纯度较高,且为边长5~10nm的方形纳米晶颗粒。将该材料作为锂离子电池的负极材料组装成电池进行电化学性能测试发现,其首次放电比容量达到1380mAh/g,在循环20圈后稳定在约100mAh/g。这使得该Fe3O4纳米片成为潜在的锂离子电池负极材料。

Under the dual pressure of energy shortage and environmental pollution, it＇s important to search for new energy material. Fe3O4 nanocrystal was synthesized by hydrothermal approach using FeSO4.（NH,）2SO4·6 H2O as iron source, oleic acid as surfactant, NaOH and ethanol as solvent, reacting at 180℃ for 10 h. The characterized results of X-ray diffraction （XRD） and transmission electron microscope （TEM） show the high purity product is nanocrystal with the side length of 5-10 nm. By using the product as anode material for Li-ion batteries, the electrochemical performance test shows the initial discharge specific capacity reaches 1 380 mAh/g and the specific capacity is about 100 mAh/g after 20 cycles. So the material is a kind of potential anode material for Li-ion battery.