The effect of pore size on the response characteristic of an electric double layer capacitor (EDLC) was closely examined. A series of phenol-resin-based activated carbon (AC) samples was prepared as average pore size from 0.94 to 1.68 nm by KOH activation by varying the activation temperature and KOH/carbonized phenol-resin ratio. The impedance properties of pouch-type EDLC cells prepared using AC samples were evaluated by applying an alternating current at 3 V between 10 mHz and 100 kHz for confirming the response characteristic. The cell based on the AC with a largest pore size (1.68 nm) showed fast response frequency, and had a high dielectric relaxation time constant as calculated from the response frequency value. The AC with the largest pore size, which consisted of both micropores (>1 nm) and mesopores (2–4 nm), was confirmed to facilitate extremely low electrolyte-diffusion resistance during the formation of the electric double layer, implying that the large pores lead to fast and stable response frequency. The presented findings suggest that AC with a largest pore size as the electrode leads to superior capacitance and response frequency characteristics in the alternating current than those of an AC with a smaller pore size.

仔细研究了孔径对双电层电容器 (EDLC) 响应特性的影响。通过改变活化温度和 KOH/碳化酚醛树脂比率，通过 KOH 活化制备了一系列酚醛树脂基活性炭 (AC) 样品，其平均孔径为 0.94 至 1.68 nm。通过在 10 mHz 和 100 kHz 之间施加 3 V 交流电来评估使用 AC 样品制备的袋式 EDLC 电池的阻抗特性，以确认响应特性。基于具有最大孔径 (1.68 nm) 的 AC 的电池显示出快速的响应频率，并具有从响应频率值计算的高介电弛豫时间常数。具有最大孔径的 AC，由微孔 (>1 nm) 和中孔 (2-4 nm) 组成，被证实在双电层形成过程中促进极低的电解质扩散阻力，这意味着大孔导致快速和稳定的响应频率。所呈现的发现表明，与具有较小孔径的交流电相比，具有最大孔径的交流电作为电极在交流电中具有更好的电容和响应频率特性。