沥青基活性炭制备及其电化学性能研究

Study on activated carbon from pitches and their electrochemical performance

选物理性能相近的各向同性沥青和各向异性沥青作为前驱体,在相同条件下进行KOH化学活化制得沥青基活性炭,通过X射线衍射光谱法(XRD)、扫描电子显微镜法(SEM)和低温N2吸附研究活性炭的微结构,以此研究前驱体结构的差异对活性炭产品微结构参数的影响,并将其作为电极材料,以1mol/L(Et)4NBF4作为电解液组装成有机双电层电容器,通过恒流充放电、循环伏安曲线和交流阻抗测试其电化学性能,发现各向同性沥青活化后具有较好的孔结构及较高的比电容(173.9F/g)、较低的内阻和较好的功率特性。

Isotropic pitch and anisotropic pitch with similar physical characteristics were chosen to be precursors for activated carbons. Chemical activations at same conditions were carried out and the effects of microstructure of precursors on characteristics of activated carbons were discussed by XRD,SEM and N2 adsorption. Electric double-layer capacitor was made by using the activated pitches as the electrode materials and 1 mol/L （Et）4NBF4as the electrolyte. A constant current charge-discharge test,cyclic voltammetry and AC impadence were used to investigate their electrochemical performance The results obtained confirm that the isotropic activated pitch has better pore structure and better specific capacitance （173.9 F/g ）,lower series resistance and better power characteristic.