CAJ | 학술논문

电化学阻抗谱(EIS)是一种很有用的研究电化学性能的技术。理想的双电层电容器(EDLC)阻抗谱的尼奎斯特图由中高频的45°线和低频的与实轴垂直的直线组成，可以用孔径分布-传输线模型来解释。然而，在研究工作中还发现，在阻抗谱的高频区出现了半圆弧区域，为此，提出的等效模型认为半圆弧可以归因于活性材料之间的接触电阻和接触电容，以及电极与集流体之间的接触电阻与接触电容。还研究了充电过程、活性炭和电解液的电导率、导电添加剂和粘结剂的含量、隔膜、活性物质附载量和极片加压等因素对阻抗谱的影响。其中，充电截止电压、活性炭的电导率、导电添加剂的含量和极片加压对半圆弧部分影响较为显著。
전화학조항보(EIS)시일충흔유용적연구전화학성능적기술。이상적쌍전층전용기(EDLC)조항보적니규사특도유중고빈적45°선화저빈적여실축수직적직선조성，가이용공경분포-전수선모형래해석。연이，재연구공작중환발현，재조항보적고빈구출현료반원호구역，위차，제출적등효모형인위반원호가이귀인우활성재료지간적접촉전조화접촉전용，이급전겁여집류체지간적접촉전조여접촉전용。환연구료충전과정、활성탄화전해액적전도솔、도전첨가제화점결제적함량、격막、활성물질부재량화겁편가압등인소대조항보적영향。기중，충전절지전압、활성탄적전도솔、도전첨가제적함량화겁편가압대반원호부분영향교위현저。
Electrochemical impedance spectroscopy (EIS) is a very useful technique for studying electrochemical behavior. The ideal Nyquist plot of electrochemical impedance spectroscopy for an electrical double-layer capacitor (EDLC) consists of a 45° line in the high-middle frequency region and a vertical line in the low frequency region, which can be explained by the transmission line model with pore size distribution. However, a semicircle loop in the high frequency region has been found in many studies. Hence, in this study, an equivalent model is proposed, in which the semicircle loop is ascribed to the contact resistance and contact capacitance between particles of activate materials, and between the activated carbon (AC) electrode and current col ector. The effects of the charging process, conductivities of the active material and electrolyte, content of conductive additive and binder, porous separator, mass loading, and exerted pressure to the electrode on the EIS spectra of EDLCs were experimental y investigated. Among these effects, the most significant factors were the charging cut-off voltage, conductivity of activated carbon, content of conductive additive, and exerted pressure.