The Preparation And Characterization Of Carbon-based Supercapacitor Electrode Materials

Supercapacitor as a new energy storage device,has the advantages of high energy density and power density,long service life,wide temperature range and no pollution.It makes up for the deficiency of traditional chemical battery such as Li-ion battery and other ordinary capacitor.The most important factor that determines the supercapacitor quality is the supercapacitor electrode material performance.This article is based on carbon nanotubes and activated carbon derived from pomelo peel and celery as electrode material.After acquiring carbon nanotube/polyaniline and activated carbon/polyaniline electrode composite by in situ polymerization,further carbonize the composite to make carbon electrode material with better electrochemical performance.The main contents of this research are as follows:(1)Based on carbon nanotubes,using 2:1,1:1,1:2 three kinds of different mass ratio,prepare carbon nanotube/polyaniline nanocomposites by in situ polymerization,and then carbonize carbon/polyaniline nanocomposites under high temperature.Analyze material appearance characteristics through SEM and study the electrochemical performance of activated carbon materials through electrochemical workstation.It is found that when the mass ratio was 1:1,the composite material reached maximum specific capacitance of 67 F/g,showing excellent electrochemical performance.At the same time,the sample also showed excellent cycle stability,after 2000 times of charge and discharge cycle,capacitance can still keep 94% of the initial value.(2)Using pommel peel as raw materials,prepare activated carbon material by biomass carbonization technology and then make activated carbon/polyaniline composite material according to the mass ratio of 1:1.Lastly,carbonize prepared activated carbon materials through high temperature.Make activated carbon material into electrode to study the electrochemical performance of activated carbon materials.The activated carbon after carbonization reached a maximum specific capacitance of 358 F/g.At the same time,the capacitance of samples after 2000 times of charge and discharge cycle can still keep 94% of the initial value,indicating good cycle stability.(3)Prepare activated carbon material using natural celery as raw materials.Make activated carbon material into electrode to study the electrochemical performance of activated carbon materials.Activated carbon materials for electric double layer capacitor have high charge and discharge performance reversibility.The activated carbon after carbonization reached a maximum specific capacitance of 425 F/g.At the same time,the capacitance of samples after 2000 times of charge and discharge cycle can still keep 97% of the initial value,showing excellent cycle stability.This shows that the activated carbon material acquired by carbonizing the activated carbon/polyaniline nanocomposites once more under high temperature has more excellent electrochemical performance.