物理化学学报Issue(11)：2071-2076,6.DOI:10.3866/PKU.WHXB201408292
双电层电容器电化学阻抗谱的实验研究
Experimental Investigation of Electrochemical Impedance Spectroscopy of Electrical Double Layer Capacitor
摘要
Abstract
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.关键词
电化学阻抗谱/双电层电容器/活性炭/接触电阻/接触电容Key words
Electrochemical impedance spectroscopy/Electrical double layer capacitor/Activated carbon/Contact resistance/Contact capacitance分类
化学化工引用本文复制引用
孙现众,黄博,张熊,张大成,张海涛,马衍伟..双电层电容器电化学阻抗谱的实验研究[J].物理化学学报,2014,(11):2071-2076,6.基金项目
The project was supported by the National Natural Science Foundation of China (51307167,51025726).国家自然科学基金(51307167,51025726)资助项目 （51307167,51025726）
