FeCl_3/石墨插层化合物的制备及储锂性能研究

Preparation and Lithium Storage Properties of Graphite Intercalation Compound

以无水氯化铁和鳞片石墨为原料,采用熔盐法制备了FeCl_3/石墨插层化合物(FeCl_3-GIC),使用X-射线衍射仪、红外光谱仪、拉曼光谱仪等研究了材料的组成结构;以所得的插层化合物为电极材料组装成扣式锂离子半电池,测试了其电化学储锂性能。实验结果表明:FeCl_3与石墨形成了二阶FeCl_3-GIC插层化合物,部分Fe^(3+)转变成了三氧化二铁。FeCl_3-GIC化合物用作锂离子电池负极材料时,在50 mA/g电流密度下,首次放电容量达到1220mAh/g,200 mA/g电流密度下循环100次后容量还能保持在355 mAh/g。FeCl_3-GIC化合物表现出良好的储锂性能,可以作为锂离子电池负极材料来使用。

A stage 2 ferric chloride-graphite intercalation compound（ FeCl3-GIC） was prepared by the technology of intercalation using metal chloride and graphite flake as raw materials. The structure and lithium storage properties of the FeCl3-GIC compound were investigated by infrared spectrometer,X-ray diffraction,Raman spectrometer,and galvonastatic charge/discharge test. The results show that partial FeCl3 has been transferred to Fe2O3 during the preparation of FeCl3-GIC. The FeCl3-GIC with expanded interlayer spacing exhibits a high initial capacity of 1220 m Ah/g at a current density of 50 mA/g.Furthermore,FeCl3-GIC still remains a capacity of 355 mAh/g after 100 cycles at a current density of 200 mA/g. Therefore,the good lithium storage properties make FeCl3-GIC promising as an anode material for lithium ion batteries.