Establishing a new testing protocol of the electrochemical stability window for electric double-layer capacitors
作者机构：School of Materials Science and Engineering Sun Yat-sen University Laboratory of Clean Energy Chemistry and Materials Lanzhou Institute of Chemical Physics Chinese Academy of Sciences College of Engineering and Applied Sciences Nanjing University Center of Industrial Analysis and Testing Guangdong Academy of Science
出 版 物：《Science China Chemistry》 (中国科学:化学(英文版))
年 卷 期：2025年第68卷第1期
页 面：217-225页
核心收录：
学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学]
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)
主 题：electric double-layer capacitors electrochemical stability window testing protocol side reaction descriptor operating limitation
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.
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