MOFs多孔碳材料在锂电池中的应用及其性能表征

利用溶剂加热的方式制备得到ZIF-8并将其作为模板,经过高温碳化作用获得含特定金属成分的金属-有机骨架(MOFs)多孔碳材料,并通过试验测试的方式对其性能进行表征。研究结果表明:XRD谱图中,在44°附近出现了非晶石墨衍射峰,由此表明经过760℃碳化处理后的掺氮多孔碳发生了石墨化转变,未观察到Zn-Z/C(760)试样形成Zn的X射线衍射峰。以760℃进行碳化生成的Zn-Z/C(760)依然还是属于正十二面体结构,达到了良好分散状态,有效促进了硫进入试样微孔的过程。经过碳化处理的Zn-Z/C(760)形成了尺寸更小的微孔,同时微孔对应的孔体积比例也发生了降低,孔径也明显增加。以760℃对ZIF-8进行碳化后,Zn比例达到2.13%,多孔碳与硫的复合组织中检测出了氮含量为14.2%,由此可以判断此时氮已掺入多孔碳内。

Application and Characterization of Porous Carbon MOFs in Lithium Batteries

ZIF-8 was prepared by solvent heating and used as a template. MOFs porous carbon material containing specific metal components was obtained by carbonization at high temperature, and its performance was characterized by experimental tests. The results show that in the XRD spectrum, a diffraction peak of amorphous graphite appears near 44°, which indicates that the nitrogen-doped porous carbon after carbonization treatment at 760 ℃ has undergone graphitization transformation, and the XRD peak of Zn is not observed in Zn-Z/C(760) sample. The Zn-Z/C(760) carbonized at 760 ℃ still belongs to the regular dodecahedron structure, which achieves a good dispersion state and effectively promotes the process of sulfur entering the microspores of the sample. The carbonized Zn-Z/C(760) forms smaller pores, and the corresponding pore volume ratio of the pores also decrease, and the pore size also increase significantly. After carbonization of ZIF-8 at 760 ℃, the proportion of Zn reaches 2.13%, and the nitrogen content in the composite structure of porous carbon and sulfur is detected to be 14.2%, so it can be judged that nitrogen has been mixed into the porous carbon at this time.