双电层电容器电化学阻抗谱的实验研究

引用本文: 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, 30(11): 2071-2076. doi: 10.3866/PKU.WHXB201408292 shu

Citation: SUN Xian-Zhong, HUANG Bo, ZHANG Xiong, ZHANG Da-Cheng, ZHANG Hai-Tao, MA Yan-Wei. Experimental Investigation of Electrochemical Impedance Spectroscopy of Electrical Double Layer Capacitor[J]. Acta Physico-Chimica Sinica, 2014, 30(11): 2071-2076. doi: 10.3866/PKU.WHXB201408292 shu

双电层电容器电化学阻抗谱的实验研究

基金项目:
国家自然科学基金(51307167, 51025726)资助项目 (51307167, 51025726)

摘要:

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.

关键词:

English

Experimental Investigation of Electrochemical Impedance Spectroscopy of Electrical Double Layer Capacitor

1.
Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China
Received Date: 28 July 2014
Available Online: 30 October 2014
Fund Project:
国家自然科学基金(51307167, 51025726)资助项目

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 collector. 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 experimentally 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.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

双电层电容器电化学阻抗谱的实验研究

English

Experimental Investigation of Electrochemical Impedance Spectroscopy of Electrical Double Layer Capacitor

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

双电层电容器电化学阻抗谱的实验研究

English

Experimental Investigation of Electrochemical Impedance Spectroscopy of Electrical Double Layer Capacitor

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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