Ok, Byeori Na, Wonjun Kwon, Tae-Hoon Kwon, Young-Wan Cho, Sangho Hong, Soon Man Lee, Albert S. Lee, Jin Hong Koo, Chong Min 2024-01-19T18:34:08Z 2024-01-19T18:34:08Z 2021-09-04 2019-12 1226-086X https://pubs.kist.re.kr/handle/201004/119294 Non-aqueous lithium-ion redox flow batteries (Li-RFBs) have recently garnered much interest because of their high operating voltage and energy density. Albeit these outstanding advantages, challenges, such as poor cyclability and efficiency, still remain in employing the practical application. In an attempt to address these problems, a series of 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO) and TEMPO derivatives catholytes were prepared and investigated as redox-active materials. Electrochemical evaluation exhibited that the introduction of polar and electron-withdrawing substituents to TEMPO was able to enhance the rate capability and cycling stability, when compared to those with the neat TEMPO. Extensive analysis of the electrochemical properties revealed that the electrophilic heteroatom stabilized the radical as well as alleviated the catholyte degradation. Overall, a careful selection of redox-active species demonstrates great promise in improving the current redox flow battery technology. (C) 2019 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved. English 한국공업화학회 Understanding the enhanced electrochemical performance of TEMPO derivatives in non-aqueous lithium ion redox flow batteries Article 10.1016/j.jiec.2019.08.027 1 Journal of Industrial and Engineering Chemistry, v.80, pp.545 - 550 Journal of Industrial and Engineering Chemistry 80 545 550 N scie scopus kci ART002542428 000501658800061 2-s2.0-85071248802 Chemistry, Multidisciplinary Engineering, Chemical Chemistry Engineering Article COMPOSITE MEMBRANE ELECTROLYTES OXIDATIONS BEHAVIOR Redox flow battery TEMPO Lithium-RFB