锂离子电容器用氧化石墨正极材料研究

Study on cathode material of graphite oxide in lithium-ion capacitor

将振实密度较高的氧化石墨材料用作锂离子电容器正极材料。利用X射线衍射分析、拉曼谱图分析、X射线光电子能谱分析、恒电流充放电测试等对材料进行了系统表征,结果表明,氧化石墨中丰富的官能团,使氧化石墨相对于活性炭和石墨有着较高的可逆比容量,在50 mA/g下,可逆比容量能稳定在120 mAh/g;而在100 mA/g条件下,比容量稳定在85 mAh/g。

The graphite oxide with high tap-density was used as the cathode material of lithium-ion electrochemical capacitor. The acquired material was confirmed by X-ray diffraction （XRD）, Raman spectroscopy, X-ray photoelectron spectroscopy （XPS）, galvanostatic charge/discharge test, and so on. The results demonstrate that the graphite oxide can deliver higher specific capacity than active carbon and graphite, due to large amount of the oxygen-containing functional groups. The graphite oxide can exhibits the reversible specific capacities of 120 and 85 mAh/g with the high capacity retention at 50 and 100 mA/g.