Establishing a new testing protocol of the electrochemical stability window for electric double-layer capacitors  

作　　者：Ruilin Hou Xiaoxi Zhao Tingting Liang Qingyun Dou Shan Xu Xingbin Yan 

机构地区：[1]School of Materials Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China [2]Laboratory of Clean Energy Chemistry and Materials,Lanzhou Institute of Chemical Physics,Chinese Academy of Sciences,Lanzhou 730000,China [3]Center of Industrial Analysis and Testing,Guangdong Academy of Science,Guangzhou 510651,China [4]College of Engineering and Applied Sciences,Nanjing University,Nanjing 210093,China

出　　处：《Science China Chemistry》2025年第1期217-225,共9页中国科学(化学英文版)

基　　金：supported by the National Key R&D Program of China(2022YFB2402600);the National Natural Science Foundation of China(22279166);the Guangdong Basic and Applied Basic Research Foundation(2022B1515120019)。

摘　　要：The electrochemical stability window(ESW)is crucial for determining the energy density of electric double-layer capacitors(EDLCs).However,current ESW testing protocols of EDLCs are strongly affected by artificial factors,thereby leading to unreliable result.To solve this problem,we first identify the key shortcomings of the traditional protocols by analyzing their test principles.Subsequently,taking an aqueous carbon-based EDLC as an example,we design a side reaction descriptor to represent the response difference in the charging capacitance to side reactions between the cyclic voltammetry and galvanostatic chargedischarge methods.With the aid of this descriptor,we propose a new ESW testing protocol,which is not only able to completely avoid the adverse influence of subjective factors but also fully consider the operating condition limitations.The protocol can be extended from the single electrode to the full device.This work proposes a more rigorous definition of ESW and provides a reliable protocol for evaluating the ESW of EDLCs.

关 键 词：electric double-layer capacitors electrochemical stability window testing protocol side reaction descriptor operating limitation 

分 类 号：TM53[电气工程—电器]