聚苯乙烯基层次孔炭材料的超级电容器器件制作工艺研究

Study on supercapacitor preparation techniques of polystyrene-based hierarchical porous carbons

利用恒流充放电、交流阻抗和循环伏安法深入研究了电极片质量、粘结剂PTFE的含量、平压压力和电解液KOH浓度等超级电容器器件制作工艺对聚苯乙烯基层次孔炭材料的电化学性能的影响。结果表明这些器件制作工艺对层次孔炭材料的储电性能有非常大的影响。当电极片质量约为9mg,PTFE含量为8%,平压压力为4MPa,KOH浓度为4mol/L时,层次孔炭材料的储电容量最大,可达135F/g;而当器件制作工艺不佳时,其储电容量出现不同程度的下降,最差时仅为56F/g,为最优工艺的41%。

In this study,the relationship between supercapacitor preparation technique and electrochemical performance for polystyrene-based hierarchical porous carbon（HPC） had been studied in detail by means of constant charge/discharge measurements,impedance spectrum,cyclic voltammetric measurements,and so on.The techniques studied here include electrode preparation conditions like electrode weight,percentage of binder（PTFE） and pressing pressure,and concentration of electrolyte（KOH）.The experimental results showed that the techniques play an important role in the electrochemical properties of HPC.When the electrode weight,PTFE content,pressing pressure and KOH concentration were 9mg,8%,4MPa and 4mol/L,respectively,HPC exhibited the highest capacitance of 135F/g.However,when changing the techniques to the case of 9mg,8%,1MPa and 6mol/L,the specific mass capacitance was as low as 56F/g,only 41% of the above optimal value.